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

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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.
I like the design, battery life and the apps page similar to Apple watch. But I just bought the Pixel 10 XL and it's not completely compatible like a pixel watch is. So I'll be selling mine once my pixel watch 4 comes in.
So I use a Pixel device and previous used all the Pixel watches since it came out. What I love about the pixel watch is, it syncs Do Not Disturb, Alam, sleep mode and constant heart rate monitor even on always on display on and you can see the heart rate changes without waking up the screen like tilt to wake functions. Heart rate is a minor thing but the rest is very useful. That's why I'm switching to the Pixel Watch 4. Will definitely miss the long battery life and design of it.
So I had OP 13 and no DND did not sync. Only Alam did. I would still had to manually do sleep mode on the Watch.
Hey Hey! So far I'm loving it! What I love the curve glass(in person looks so much better). The UI is so much better IMO. How the notifications pop up, the different themes are just something about it makes it that much better. It charges just as fast as the OPW 3! Sure battery life is not as superior to OPW 3 but it's easily 2 days with workouts, notifications, and always on display. More than enough for me. One thing that pixel watch does that no other wearOS watch does a live heart rate monitor on always on display. Don't need to wake the watch up to see my heart rate. Now I get it, some people don't care about that feature but that is something I use all the time and very useful. And the integration with my Pixel phone is just that good! BTW this is my 3rd Pixel Watch and they came a long way. https://preview.redd.it/gxih1cictgwf1.jpeg?width=2268&format=pjpg&auto=webp&s=d9b439e1d307073c9b6462f9d072715adf8ebf94 Would I go back to the OPW 3, sure if they can sync DND, Alam, Sleep settings with a OnePlus Phone. Maybe with the 15, they will do that? Idk. I will miss the little map of riding a bike, walk or running of the Ohealth app does similar to Strava. Which is pretty cool! Design is subjective but I definitely did get more compliments on the OPW 3 vs the Pixel Watches. But I will be selling my OPW 3 since I no longer use it. Hope this helps!
@gdir You guys both say 'fast charging', but what does that mean exactly? I used the OPW2 for about 2 weeks before my OPW3 came in the mail and I compared with both chargers. The 2 charger was slower by about 10-15mins on each watch. With my 3 charger the most it ever takes is just shy of an hour, about 58-59 mins, and that's from 0-100%. If there's even 5-10% already on the watch when I snap it on it'll take 40-45 mins. So with using the 2 charger, that would be 1hr-1:15hr. I know 15 mins doesn't sound like a lot, but I never have to charge more than an hour, and that's huge to me. It's the fastest charging watch with 2nd to longest battery life, while still being the most capable I've ever used. I've used Garmin, Fitbit, and this OPW3 over the last 10 years. (I'm not including Moto 360 watch from 2014, that was a failure...)
OP, may I make another suggestion for you to consider? (I'm wearing a Pixel Watch right now so don't come at me Pixel lovers) The battery life is indeed a concern on these watches. If you want Wear OS and are open to a suggestion - take a look at the OnePlus Watch 3 in the smaller 43mm size. It will be very similar in size to your Garmin Venu that you had. You can get about 3 days of battery very easily and if you switch to the battery saver mode can easily go for days longer. I had the larger 46mm size of this watch and loved it - battery life is so good - but ultimately I needed (wanted) LTE connectivity for my watch and so I got the Pixel Watch 3 45mm LTE version. It's a nice watch but battery life is not good compared to Garmin, etc. Anyways, my suggestion is to check out the OnePlus - it's a beautiful, full featured, Android watch!
Love mine. Zero issues.
Garmin is the second best choice imho. After that, it doesn't really matter. You get incredibly similar capabilities with some style differences and a pitiful battery with the rest. OPW3 is so good.
I returned my Watch 8. Went with OPW 3
It's works pretty well for me. It has great battery life, which the watch 8 did not. The health tracking feels the same as Samsung as well, which is to say, I agree that it sucks. WearOS 5 feels the same as 4, which feels the same as 3. I'm not a tech expert, but I like my OP3 better.
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

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Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series