Fitbit - Google Pixel Watch 4

Honestly it seems like people have ups and downs with their experience. Mine was perfectly fine. That being said the PW3 & 4 are excellent competitors to the Apple Watches core features.

Looks like I'll trade in my PW3 for the PW4 45mm. Why? Battery life. It feels like my watch's battery has degraded since getting it Day 1.

I've tried Google Pixel and Samsung Galaxy and at the moment I'm liking the OnePlus Watch 3. They all have their strong points but the OnePlus has fewer weak points.

Yes. I never had any issues with mine. When my pixel watch acts up I charge up my charge 4

I've had a bunch of watches -- currently on the PW3 (large) and previously a bunch of Ticwatches. The battery life on the Ticwatch was amazing, but the software was buggy and the updates were slow. Apart from a few issues around swim tracking, the Pixel Watch is amazing. I regularly get 36+ hours of battery life and I don't have any issues with going two days without charging. Another option is a fitbit. You get most of what you want, with better battery life, but less powerful notifications. Also -- PW and Fitbit both give you a daily update based on your sleep and blood oxygen, heart rate etc to give you a better idea of your state of health and readiness. So I don't check them all directly, but it does help. And the PW3 does have a loss of heartbeat detector so that if you faint, it will call emergency services (in a few countries right now)

I use a Pixel watch. Golf Pad (the app I use to track my rounds) is compatible with the watch.

Smartwatches aren't really medical devices, you should really consult with your doctor for advice in a proper monitoring device. That being said, if you have an android phone, pixel watches are hard to beat. Best heart rate sensors and continuous heart rate monitoring. ECG cannot be monitored passively as you need to close a circuit around your body, which means there's an electrode underneath the watch and the other is the crown, you must take spot readings with the opposite hand you're wearing it on.

Apple Watch doesn't work on Android and Pixel Watch doesn't work on iOS

But it doesn't work on Android, it's a comparison of Apples and oranges

The sensors and software smoothness are better, battery is a bit behind but the 45mm last 40h+

The built in software for runners is very poor on the Pixel Watch. Even the free software from places like Strava aren't much better. If you want things like lap alerts and customizable faces that can be set up for interval training, you'll need to spend some cash on apps like SportWerks or Gear Tracker. Even then, they don't have the lap button mapped to the physical buttons, so you're always messing up your lap times. That said, it's pretty decent for easy runs and long runs. Personally, I just use the Pixel Watch for most runs, and pull the Garmin out whenever I'm on the track or doing intervals.

From an older Galaxy Watch? Yeah the Pixel Watch will be more accurate. From a Galaxy Watch 7 or 8? It will be roughly the same. GPS was an area of difference but the GW7 has been improved with updates and the GW8 is pretty much par with PW. For most cases any of the major smart watches like the GW, PW or even AW are close. So I wouldn't make your decision on that basis. Comparing the Galaxy Watch and Pixel Watch I'd look at what device you're pairing it with and the unique features each offers.