Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

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It is and I have the Nova and love it. But TBH I mean going beyond health and notifications.
I own a Scanwatch Nova, a beautiful and premium-built watch. Its measurements are reasonably accurate, and the accompanying app is user-friendly.
I've had the scanwatch 2, and Scanwatch Nova. Build quality wise, the Nova was great, although neither were accurate sadly.
Yeah agree with above, I take my Nova off when weight lifting. I'll wear it when I run but I'm not convinced by the heart rate tracking during exercise tbh. It does come with a rubber band for sports. But for a steps tracker which looks nice and tells the time, it's great
For me, tracking walking activities, it’s pretty good. Heart rate / steps etc all good. I do have a Nova though so not a totally equal comparison.
The Nova is very good, but be aware it's a health watch! Heart rate tracking for sports activities won't be on par with an Apple Watch or Garmin, which have more advanced heart rate sensors and more sophisticated processors. Withings is trying to find a compromise between battery life and health data. The Withings is very good for everyday health tracking; the heart rate accuracy when you're not exercising is very good. It also tracks atrial fibrillation, sleep, SpO2, and ECG. You can track sports activities like hiking, leisurely cycling, and a bit of running, but for high-intensity sports, the accuracy won't be good. Ultimately, it depends on the person. My wife uses a ScanWatch 2 for sports, and the heart rate is detected very well. There are too many factors that affect the heart rate sensors: skin color, body hair, blood flow, sweat, and tattoos. I wear my Nova every day, but as soon as I exercise, I put on an Apple Watch.
Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

Garmin
Forerunner 955 Series
Best value, clear MIP screen; limited smartwatch features.

Garmin
Fenix 7 Series
Durable, multi-week battery, flashlight; high price, buggy software.
Garmin
Instinct 2 Series
Rugged, solar multi-week battery; bulky, small screen readability issues.

Garmin
Enduro 3
Multi-week solar battery, lightweight; but bulky form factor.

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Oura - Oura Ring Series

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Apple - Ultra Series

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Garmin - Enduro 3

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Garmin - Fenix 7 Series

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series