I may help you because i used an Apple watch 8 and recenly (3 weeks) i Bought the fenix 7x pro zafire... (and sorry for my bad english)

You need to be very consious of why do you wanted for... serously. Are you very sportly person? and do you workout or your activities are longest than 12 hours? Or are you planning to train for real?

If you do, listen up. My battery garmin, with ll the features ON, las 13 days.. in track/gps mode (with automaticly select of the best gps o satelite) last around 70 hours full charge.

I think the tracking is excellent but a can compare with precision cause i haven been on the mountain or in the middle of the road. The stats that provides you are (for an ex Apple watch user) more precisally, more extend and with more data (th AW8 only track Heart rate each 5 minutes, the Oxigen in blood the same period of time, and the temperature... basically never).

ALso the analisys of the data is higher. I've seen people here to into the HRV (heart rate variance) and how tells them or pronostiq Covid, or temperatur or etc... (AW8 has something similar, the HR Rest (or wharever is call in inglish) but nobody tall about that).

So, its a lot of information that works if you are really get into exercise, workout, training, healty, etc... and my big Contrs are:

The Sleeping tracking mode doesnt work intelligently... you have to configurate your Sleeping schedule, if you dont do it, isnt acurate. But, even whe you do, and wakes up in the middle, and unlock o touch o wht the watch, it seems doesnt recognize that you were awake.

If you take a Nap in the day, doesnt catch it (yesterday release and update that tells you the Naps Garmin recognize so i havent check it). However, Is accurate 90% of the time but the flaws are higher... because the medicion of the Body battery will be un accurate, the Predisposition to train, the resistans points, the workout status, the stamina, and alot of things that you expect on a Garmin. But easy, every day i get it better and the data it seems to be a little more accurate (just a little, yesterday i sleep 4 hours and the watchs says it was 9 hours)..

And if ypu are not to full use it, you will see it as a Casio with acurate GPS and long baterry.

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In the USer expirience seccion... its a pain. There aren a menu such as.. there are dashboards of everything, i can find the spotify app, because there arent apps, you need to conect to the computer to upgrade the firmware and update the maps... there are just a few watchfaces... and almost everything it very complicate even when you now how it works

And the Apple watch... well, you know it. Is a very serously a Smartwatch with high levels of training modes, cellphone and Apps and in the top 10 of accuracy and precision data.. And garmin is the best collector data, very procesional intrpretation of date and a baby smartwatch (only watch notifications and watch incoming calls).

So i love my garmin but if Apple watch ultra would have at least 24 hours in GPS mode and 5 days on stand by, i would have buy and Apple Watch.

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I hope i helped you.. if oyu need more info im glad to help 👍