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

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You can get an Amazfit Bip 6 for about $60USD. Not the most accurate GPS tracking, but decent. Kind of slow to acquire too. But killer battery life. No barometric or GPS elevation on the watch itself though. I think you'd have to go up to the Active 2 to get a watch from them with a barometer for altitude, about $125.
As a long term Galaxy Watch wearer (from gen 1 to 7) and an Apple Watch gen 11 wearer (for 3 days), IMO, the Active 2 kicks both Samsung and Appleās ass. Not having to charge your watch every single day is a game changer. At a fraction of the price, sure, youāre not gonna get all the bells and whistles but you get enough and donāt feel ripped off paying ridiculous prices for a bunch of superfluous features. I have a Bip 6 and Active 2 to cover square vs round and still had enough money left over to get a Nintendo Switch 2.
Amazfit Bip 6. I switched a couple weeks ago after my sense died on a cruise. A bit of a learning curve, NO SYNCING, the battery on this thing lasts 8 days, and Iām a runner (just for the context that it is used frequently), Music controls, the only annoying part is the readiness suggestions and I was able to turn that off. Iām blown away and this thing was only $79.
I was in the same drill few months ago. I went with Amazfit bip 6. It was easy enough to use for my parents. They use it principally for checking hr, sleep, steps, check messages, answers calls and they like the alert of inactivity, so they get up and walk a bit. But they do not see the point of tracking activities at all. So at the end of the day Iām glad I went with a cheaper watch but more useful for their needs. I think that the most important feauture for them, was to answer calls on the watch, and see when they get messages. So they keep their phone in mute, without having to have a ring every time they receive a message or a call. Thatās good for everyone ;)
Bip 6 user here, for about 5 or 6 weeks. I'm having the exact same issue, have been blocked from receiving any HRV or sleep phase data three days out of the past five simply because my sleep duration (and how long I'm awake between sleep attempts when applicable) doesn't *quite* meet whatever overgeneralized algorithm they're using on the backend. I make extra sure to keep the sleep schedule aligned, everything, but nope, having secondary insomnia locks me out of key features. I sent in feedback yesterday when it happened the 2nd time but came to reddit to look for similar experiences after this newest (3rd) time. I'm both glad I'm not alone and sorry it's affecting your experience too. Given I'm bedbound, I use the watch solely for sleep quality data, heart rate every minute, and HRV, all very necessary data points for tracking my health. Completely losing 2 out of 3 on random days because my body works differently than the devs think it should is deeply concerning.
Amazfit Balance 2 should be about that price. The T-Rex 3 as well for something more sporty. The T-Rex 3 pro is out of that price range, but it's worth the extra. Or Bip 6, or Active 2 round or square, for a cheaper option with the same sensors and 90% of the features and limited local storage. The current gen of Amazfit devices are really very good.
Amazfit bip 6. Super cheap, great sensors, excellent activity tracking, battery lasts for several days. If you get an apple watch I guarantee having it to charge it daily or even twice a day will get very old very fast.
Amazfit bip 6, the 5 is not worth getting.
Always halve manufacturer's battery life estimations. You'll get a cool 6 days or so battery life, but it depends on your usage. Notifications work perfectly, especially on android where you can reply to messages and view WhatsApp images and whatnot
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