The figures come from the official technical sheets published by Google and OnePlus.

3. Autonomy: two opposite visions

Pixel Watch 3 - The daily charge assumed

Google goes from 306 mAh (generation 2) to 420 mAh. In practice: 36 hours with permanent screen, active Wi-Fi, an hour cardio session and sleep monitoring. Quick recharge filled 60 % in 30 minutes - the time of a shower or coffee.

OnePlus Watch 2 - The week in one blow

The “Dual-Engine” architecture delegates simple tasks (dial, notifications) to the RTOS coprocessor, leaving the snapdragon to sleep. Measured result: three to four full days with Always-On; Up to six if the function is cut. A long GPS session (marathon + music) starts 30 % battery. Complete recharging in 65 minutes with the Supervooc charger provided.

4. Design and comfort

Materials

• Pixel : polished steel, curved glass, fine notch crown. Sliding lock owners.
• OnePlus : Steel 316L Microbilled, fluted telescope, integrated horns. Standard 22 mm bracelets.

Wrist

Pixel Watch 3 41 mm: 36 g Naked box, slips under a sleeve. The 45 mm version remains measured (42 g). OnePlus Watch 2: 49 g, 47 mm in diameter; More present, but well balanced thanks to the textured fluoroélastomer bracelet.

Readability

The two screens reach 1000 nits. The sapphire glass of the OnePlus collects the micro-scratches better; The Gorilla Glass 7 of the Pixel is already very well with the keys to a city bag.

5. Wear OS interface: fluidity and ecosystems

Animations and launches

The bone scrolls over both watches. On OnePlus, the flash transfer between processors avoids slowness when returning to the home screen. On Pixel, Google bridles some animations when the battery drops within 15 %: the fluidity remains, but the transitions are simplified.

Integrated services

• Pixel : Complete Google Wallet (Payment + Transport titles), Fast Pair Audio Instant, Matter home automation control.
• OnePlus : Google Wallet limited to payment, OnePlus camera trigger, Zen Mode clock on the wrist.

Vocal assistants

Pixel: native Google assistant, "Hey Google" trigger, brief contextual responses. OnePlus: choice between Alexa and Google assistant; A period of a second due when the Snapdragon wakes up.

6. Health and sport: two philosophies

Pixel Watch 3 - The Fitbit imprint

• ECG Medically certified, exportable PDF report.
• Daily shape score: sleep combination, stress, activity.
• Stress monitoring by cardiac variability and skin temperature.
• Irregular heart rate alerts in the background.

Weak point: no double-band GPS, sometimes softened course in urban canyon.

OnePlus Watch 2 - Outdoor versatility

• 120 sporting modes, including skiing, rowing and racket sports.
• Duo GPS L1+L5 precise, even between buildings.
• VO2MAX on the majority of cardio profiles.
• Automatic barometer with altitude graph in real time.

Absence of ECG, monitoring of basic stress: OnePlus aims at performance before clinical health.

7. Connectivity and additional functions

• Optional on both watches; The pixel switches better between ESIM and Wi-Fi without micro-cuts.
• Music storage: 32 GB each, SPOTIFY Off-line and local files compatible.
• Resistance: 5 ATM for both; Military standard 810h only at OnePlus.
• Home automation accessories: pixel directly pilots matter devices; OnePlus offers a lamp widget to control the flash of the smartphone.

8. Updates, price, availability

Pixel Watch 3 : release October 2024, € 399 Wi-Fi / € 449 LTE. Three major bone versions, monthly fixes for five years. OnePlus Watch 2 : release March 2024, € 329 Bluetooth / € 379 LTE. Two years of bone, quarterly fixes.

On the field, the Pixel is already at € 369, the OnePlus sometimes drops at € 299 during the promotions.

9. For which user?

• Pixel Watch 3 : You live in the Google ecosystem, pay with your watch, look for a reliable ECG and a discreet case.
• OnePlus Watch 2 : You go hiking three days, need a specific GPS, refuse to recharge every night, accept a wider format.

10. Express summary

• Autonomy: ≈36 h for pixel; 72-100 h for OnePlus.
• Comfort: 41/45 mm Light at Google; 47 mm massive but stable at OnePlus.
• Health: ECG, Advanced stress, temperature on Pixel; Multisport, barometer, double-band GPS on OnePlus.
• Ecosystem: Wallet + Home + Fast Pair for Pixel; Super-fast load and universal bracelet compatibility for OnePlus.
• Official price: 399-449 € VS 329-379 €.
• Updates: 3 years OS Pixel, 2 years old.

11.

Pixel Watch 3

Available on the Google store and specialized resellers. The online configurator allows you to test color of the housing and augmented reality bracelets. Free return within 14 days; Complete test on passion time: Read the detailed test.

OnePlus Watch 2

Sold on OnePlus.com and Amazon, delivered with 7.5 W charger and Fluoroélastomère bracelet. Standard 22 mm bracelets can be found everywhere, from artisanal leather to Milanese meshes.

Do you still hesitate? Compare the Pixel Watch 3 to the Galaxy Watch 7 in our backrest: Pixel Watch 3 vs Galaxy Watch 7.

12. Latest words

Choosing a connected watch is choosing your pace: express recharging every morning or freedom to leave the charger at home. The two options are solid; Your daily use will decide.