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

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Garmin swim 2. Gives you pretty accurate yards that you can see while swimming. My Fitbit charge wouldn’t show distance until I stopped and synchronized with my phone after. Also, wet touchscreen on the Fitbit is useless.
Using Garmin Swim 2. Happy with its function for tracking laps in indoor pool, took a little getting used to for accuracy. I have to be deliberate and smooth on my turns. Original band was tight on my large wrist, larger band was expensive, around $40.
This is my issue. I want out of the Garmin ecosystem altogether. My swim2 routinely adds an extra 25 and I'm not doing anything strange. I do hit the lap button to mark the end of a stretch. I don't have hope that a different Garmin will be better since it's most likely the same code under the hood. I loved my apple watch until I busted it. I'm considering replacing it but I'd love to leave the Apple ecosystem behind as well. I'm really stumped on finding a replacement that will match the apple functionality. I don't think it exists.
Well, I had a Garmin Swim 2 for four years and it was awesome, but it's lack of smart features and AMOLED screen made me go for a Fenix 8. I tried an Apple Watch Series 8 years ago and it had serious issues with distance tracking (tracked 150m first 200m I swam, and that NEVER happen with Garmin watches, very annoying), and it only is fine if you are a lap swimmer because you can't use physical buttons to stop and go. Definitely is not a good swimming watch. It's my opinion, of course. Vivoactive and Forerunner (that's what Garmin told me) doesn't have pace alert while swimming.
You have to know that pace alert it's only available on Garmin Swim 2 or the Fenix Series. It's very important if you want help to keep your pace and is why I switch from my old Swim 2 to Fenix 8, not to Forerunner.
I had a Swim 2 and now a Fenix 7S Pro since 2 years. New sensor Elevate 5 is 10x and it tracks HR very well if worn well. I think that for swimming smaller is better, so I prefer 42 mm over 47 or more (lighter, less water drag and so more stable and more accurate HR). I also developed a swim data field to track training zone using the pace. Very satisfied.
I've got a Garmin Swim 2 watch and have been really pleased with it. GPS accuracy seems decent too.
I have that too. I have a Garmin swim 2 just for when I go swimming
I had my gum some too for you were too and it has not had any problems . I mean in the pool. It's usually 85°
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

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Oura - Oura Ring Series