5.0

Ditto re the battery life. I have next to no set routines so for a space cadet it is bloody brilliant… I lost my charger for over a week and a half and it’s still cruising along - vs my Apple ultra, which drives me mental with how often it needs a lifeline.

If I had your goals, I'd almost certainly go in for the Whoop. It does a great job with sleep, HRV, and activity tracking if nothing else. I haven't heard about anything that compares with performance in those ways together with convenience. The 5.0 battery life is also a huge quality of life upgrade. It feels like I barely have to charge it, so it's just always there in the background and not bothering me. No more tamagotchi energy like the old ones.

My own personal data showed different for HR accuracy. Apple Watch Ultra 3, Pixel Watch 4, and even Garmin Forerunner 965 did very well compared to Polar H9 chest strap. The Amazfit Helio Strap was even closer. But, Whoop 4.0 and 5.0 devices are just "all over the place" for HR. I don't have an Oura to compare [https://imgur.com/a/C0eXjXl](https://imgur.com/a/C0eXjXl) These are all walking on a treadmill at 3.0 MPH to try to get an "easy" workout for the devices (so no running, no cycling, etc)

I have a charge 6 and bought an Air in black a few days ago. The metrics are the same minus any of the extra Google features and on demand functions the screen gives you. For me the charge 6 is more comfortable to wear. It may be a touch heavier but I don't even notice it. Even when sleeping. The way the Air sits on my wrists makes it less comfortable since the band forces it to not completely lay flat without using too much pressure vs the charge 6 is more spread evenly. Maybe that'll change as new bands come out. I prefer to wear the charge 6 when I sleep as well. I wish the Air was my preference since I'd like to wear a normal watch without looking weird along side the charge 6. I mainly use it for sleep and steps. With the step counting that really doesn't fit a bicep band. I even find the heavier Whoop 5.0 more comfortable with it's basic nylon band.

I came over from Apple Watch and love my 5.0, paid for 18 months but if I were you I’d just stay on Apple Watch. Feel like Apple Watches are only getting better and 3rd party watch apps like Bevel are a solid alternative ($50)/year. Whoop as much as I love it is overpriced for the long term value. Great for building strong habits and honestly love the no screen sometimes. That being said, I believe Apple will come out with a watch air model next year (slimmer/low profile) design similar to the iPhone Air this year. That’s when the momentum will really switch to Apple.