Samsung Galaxy Watch Ultra vs Google Pixel Watch 3 (45mm)
The Samsung Galaxy Watch Ultra is the flagship option here, boasting an impressive battery life of up to 100 hours in power-saving mode. In comparison, the Google Pixel Watch 3 (45mm) offers a vibrant display at 2000 nits but only lasts 24 hours with the always-on display enabled. If you're contemplating which smartwatch to invest in, the Galaxy Watch Ultra's extended battery life is a game-changer for active users. Key specs: Weight: 2.13 oz vs 1.31 oz and Display: 3000 nits vs 2000 nits.
Why compare these? The Samsung Galaxy Watch Ultra (premium flagship) and Google Pixel Watch 3 (45mm) (high-end) represent different approaches to smartwatches. While they may appeal to different budgets, many buyers consider both options. This 2026 comparison helps you decide if the differences justify the price gap.
As an Amazon Associate I earn from qualifying purchases.
Key Differences at a Glance
| Aspect | Samsung Galaxy | Google Pixel |
|---|---|---|
| User Rating | 4.4★ (272 reviews) | 4.4★ (1,794 reviews) |
| Top Strength | True multi-day battery life (up to 100h in power saving) | Significantly larger and brighter display (2000 nits) than predecessors |
| Main Drawback | Large 47mm square-circle design may not fit smaller wrists | Battery life rated for only 24h with AOD (daily charging required) |
| Market Position | ✓Flagship | Premium |
Samsung Galaxy Watch Ultra
Android 11.0 or higher with 1.5GB+ RAM; Samsung Galaxy phone required for Energy Score, ECG, Sleep Apnea, and IHRN features
Wear OS 5 powered by Samsung (One UI 6 Watch)
47.4mm H x 47.1mm W x 12.1mm D
Titanium (Grade 4) frame with cushion design; Sapphire Crystal glass
Google Pixel Watch 3 (45mm)
Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS
Wear OS 5.0
45mm diameter x 12.3mm height
100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5
Only the specs that differ are shown here. Winners are highlighted when the data is clear.
+Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
Expand
Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
Comparison: Samsung Galaxy Watch Ultra vs Google Pixel Watch 3 (45mm)
Samsung Galaxy Watch Ultra
Google Pixel Watch 3 (45mm)
| Criterion | Samsung Galaxy Watch Ultra | Google Pixel Watch 3 (45mm) |
|---|---|---|
| Rating | ★4.4(272)Amazon | ★4.4(1,794)Amazon |
Compatibility | Android 11.0 or higher with 1.5GB+ RAM; Samsung Galaxy phone required for Energy Score, ECG, Sleep Apnea, and IHRN features | Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS |
Operating System | Wear OS 5 powered by Samsung (One UI 6 Watch) | Wear OS 5.0 |
Case Size | 47.4mm H x 47.1mm W x 12.1mm D | 45mm diameter x 12.3mm height |
Case Material | Titanium (Grade 4) frame with cushion design; Sapphire Crystal glass | 100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5 |
Display Type | Super AMOLED; Always-On Display; Peak brightness 3000 nits | Actua Display (AMOLED LTPO); 1–60Hz responsive refresh rate; Peak brightness 2000 nits; Minimum 1 nit |
Display Size | 1.5 in (37.3 mm) circular display | 1.4 in (approx. 40% more screen area than Pixel Watch 2) |
Resolution | 480 x 480 pixels | 456 x 456 pixels (320 ppi); DCI-P3 color |
Always On Display | Yes | Yes |
Water Resistance | 10 ATM + IP68 (ISO 22810 standard); Ocean swimming capable | 5 ATM (ISO 22810:2010); IP68 (Dust and water resistant) |
Durability | MIL-STD-810H certified; Operating temp -20°C to 55°C; 9000m altitude resistance | IP68 dust and water resistance rating; Custom 3D Corning Gorilla Glass 5 |
GPS | Dual-frequency GPS (L1+L5); Glonass; Beidou; Galileo | GPS, GLONASS, Galileo, BeiDou, QZSS |
Connectivity | LTE (eSIM standard on all models); Wi-Fi 2.4+5GHz; Bluetooth 5.3; NFC | 4G LTE (optional); Wi-Fi 6 (802.11ax) 2.4GHz + 5GHz; Bluetooth 5.3; NFC; Ultra-Wideband (UWB) |
NFC Payments | Samsung Wallet / Google Wallet | Google Wallet |
Sensors | Samsung BioActive Sensor (Optical Bio-signal + Electrical Heart + Bioelectrical Impedance Analysis); Temperature sensor; Accelerometer; Barometer; Gyro sensor; Geomagnetic sensor; Light sensor | Compass; Altimeter; Red and infrared sensors for oxygen saturation (SpO2); Multipurpose electrical sensors (ECG); Multi-path optical heart rate sensor; 3-axis accelerometer; Gyroscope; Ambient light sensor; cEDA sensor (stress); Skin temperature sensor; Ultra-Wideband |
Health Features | Energy Score; Sleep Apnea detection (FDA authorized); AGEs Index; Body Composition; ECG; Irregular Heart Rhythm Notification; Cycle Tracking with skin temperature; Sleep coaching | Loss of Pulse Detection; Daily Readiness; Cardio Load; Target Load; Sleep Profile; ECG app; SpO2; High/low heart rate notifications; Irregular heart rhythm notifications; Skin temperature variations; Body Response (stress detection) |
Workout Modes | Multisport tile (Triathlon/Duathlon/Aquathlon); Functional Threshold Power (FTP) for cycling; Race Partner; Track Back; Custom workouts via Quick Button | Advanced Running Form (Cadence, Stride Length, Vertical Oscillation, Ground Contact Time); Custom Runs; Interval Training; 40+ exercise modes including HIIT, Pilates, Strength, Cross-country skiing, and more |
Storage | 32GB | 32GB eMMC flash |
Speaker Mic | Speaker (with Siren support); Microphone | Built-in speaker; Built-in microphone |
Calls | Yes (LTE standalone or via paired phone) | Yes (Bluetooth); LTE models support standalone calls |
Battery | 590mAh; Up to 100 hours (Power Saving); Up to 60 hours (Normal use, AOD off); Up to 48 hours (Exercise Power Saving) | 420 mAh (typical); Up to 24 hours (Always-on Display enabled); Up to 36 hours (Battery Saver mode) |
Charging | Fast Wireless Charging (WPC Inductive); Proprietary puck required for max speed | USB-C Fast Charging Cable (included); 0–50% in ~28 min; 0–80% in ~50 min; 0–100% in ~80 min |
Weight | 60.5 g (Body only) | 37 g (without band) |
Band Sizes | One Size (fits 145–205mm wrists via Dynamic Lug System) | Active Band: Small fits 150–185 mm wrists; Large fits 165–215 mm wrists |
Extras | Quick Button (customizable); 86dB Emergency Siren; Night Mode watch face; Gesture controls (Double Pinch) | UWB for Watch Unlock and finding devices; Google Home control; Camera Remote for Pixel phones; Offline Google Maps; Recorder app |
| Pros |
|
|
| Cons |
|
|
As an Amazon Associate I earn from qualifying purchases. | Check Price on Amazon→ | Check Price on Amazon→ |
Samsung Galaxy Watch Ultra
Android 11.0 or higher with 1.5GB+ RAM; Samsung Galaxy phone required for Energy Score, ECG, Sleep Apnea, and IHRN features
Wear OS 5 powered by Samsung (One UI 6 Watch)
47.4mm H x 47.1mm W x 12.1mm D
Titanium (Grade 4) frame with cushion design; Sapphire Crystal glass
Super AMOLED; Always-On Display; Peak brightness 3000 nits
1.5 in (37.3 mm) circular display
Pros
- True multi-day battery life (up to 100h in power saving)
- Extremely durable Grade 4 Titanium build with 10ATM rating
Cons
- Large 47mm square-circle design may not fit smaller wrists
- Key health features (ECG, Sleep Apnea) locked to Samsung phones
Google Pixel Watch 3 (45mm)
Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS
Wear OS 5.0
45mm diameter x 12.3mm height
100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5
Actua Display (AMOLED LTPO); 1–60Hz responsive refresh rate; Peak brightness 2000 nits; Minimum 1 nit
1.4 in (approx. 40% more screen area than Pixel Watch 2)
Pros
- Significantly larger and brighter display (2000 nits) than predecessors
- Advanced running metrics (stride, oscillation) without external pods
Cons
- Battery life rated for only 24h with AOD (daily charging required)
- Strictly incompatible with iPhone (Android 10+ only)
Which one is better?
The Samsung Galaxy Watch Ultra is the better buy for most people - its 100-hour battery life crushes the Google Pixel Watch 3 (45mm). That said, grab the Pixel Watch if you prefer a lighter design at 1.31 oz - it's easier on the wrist for daily wear.
Who should buy each?
Choose the Samsung Galaxy Watch Ultra if: you need up to 100 hours of battery life, you want a super bright 3000 nits display for outdoor use, or you require advanced health features like ECG and Sleep Apnea detection.
Choose the Google Pixel Watch 3 (45mm) if: you prefer a lighter watch at 1.31 oz, you love the deep integration with Google services, or you want a vibrant 2000 nits display for everyday use.
Safe Choice Buyers
More widely tested with 1,794 reviews vs 272
→ Choose Google Pixel
Premium Buyers
Higher-tier option with more premium features and build quality
→ Choose Samsung Galaxy
Value Seekers
Better value proposition for buyers who don't need top-tier features
→ Choose Google Pixel
True multi-day battery Priority
True multi-day battery life (up to 100h in power saving)
→ Choose Samsung Galaxy
Conclusion
With the key differences outlined, the decision should be clearer. Both options deliver quality—choose the one that fits your priorities.
Bottom line: Both products share a 4.4★ rating, making this comparison particularly close. Your decision should come down to which specific features matter most to you.
Frequently Asked Questions
+Which is better: Samsung Galaxy Watch Ultra or Google Pixel Watch 3 (45mm)?
Samsung Galaxy Watch Ultra is the better choice if you prioritize true multi-day battery life (up to 100h in power saving). Google Pixel Watch 3 (45mm) wins if you value significantly larger and brighter display (2000 nits) than predecessors. Both are rated highly (4.4★ vs 4.4★), so consider your specific needs and budget.
+What are the main differences between Samsung Galaxy Watch Ultra and Google Pixel Watch 3 (45mm)?
Key differences: Samsung Galaxy Watch Ultra offers true multi-day battery life (up to 100h in power saving), while Google Pixel Watch 3 (45mm) stands out with significantly larger and brighter display (2000 nits) than predecessors. Consider that Samsung Galaxy Watch Ultra large 47mm square-circle design may not fit smaller wrists. Meanwhile, Google Pixel Watch 3 (45mm) battery life rated for only 24h with aod (daily charging required). Check the detailed specs table above for a complete comparison.
+Where can US buyers get the best price?
For US buyers, Amazon typically offers competitive pricing with Prime shipping, easy returns, and reliable warranty support. We recommend comparing prices on both products using our affiliate links above—prices fluctuate regularly, and you may find sales or deals.
+Is this comparison up to date?
Yes, this comparison is current for 2026. We regularly verify specs, ratings, and availability. Last verified: January 27, 2026. PageBen uses affiliate links for monetization, but our recommendations are research-driven and independent.
Affiliate disclosure
PageBen uses Amazon affiliate links. If you purchase through our links, we may earn a commission at no extra cost to you. This supports independent content for US shoppers.