Garmin
Forerunner 255 Series
Long battery, but wrist HR often inaccurate.
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I’ve used Apple Watches since the first waterproof one - series 3? - no issues. I found my Garmin fenix 6 was terrible for laps, I’m currently on an ultra (1) and it’s fine. I sometimes end up on an odd length but usually ok.
I’ve had my epix pro for 3 years and it’s great watch. The screen is just a bit too dim for my aging eyes and I dislike how poorly the amazing data Garmin collects is presented in the app. Making the switch back with AW3 but not going to sell off my Garmin because I still love it
I have the series 3 still
My apple watch 8 has done a few hundred thousand yards swimming over the last 2 years and still works perfectly if that makes you feel better. I also used to swim with my Apple watch 3 all the time and never had issues either.
I'm with you. The only reason I even bought one was I got a used S3 so my older iPhone would unlock automatically while I was wearing a mask at work, then I thought the workout tracking was nice so I got a new S7. Now that I don't wear a mask regularly, it's strictly a workout tracker. I don't think I'll buy another Also it makes me MISS a lot of notifications due to how I have it set up. Some whatsapp contacts are set to silent when they send a text. So it will (silently) display the text on watch screen when I am not looking, and then consider that to count as "well he's seen the notification, time to clear it from his phone lock screen as well" So I just end up missing those entirely. Without my watch on, they stay on my phone lock screen as they should
I had an Apple Watch Series 3 and ended up getting the forerunner 965 earlier this year. I love the Garmin because it doesn’t have all the extra features of the Apple Watch and the battery life is outstanding. I realized I was only using my Apple Watch for exercise and didn’t like the extra notifications it gave me.
Garmin
Forerunner 255 Series
Long battery, but wrist HR often inaccurate.

Garmin
Forerunner 955 Series
Endurance battery, value king, but clunky UI.

Garmin
Fenix 7 Series
Rugged, long battery, maps, but HR and software can struggle.

Garmin
Enduro 3
Unrivaled multi-week battery, solar-charged, but bulky.

Garmin
Forerunner 965
Lightweight, vibrant AMOLED, maps, but wrist HR and swim issues.

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Oura - Oura Ring Series

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Apple - Ultra Series

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Garmin - Fenix 7 Series

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Garmin - Fenix 7 Series

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Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series