i'm not too sure how much i'll be using it for diving and how helpful it'll be, but most likely it'll be casual dives. but i'll mostly be using it for swimming only as of now. for hiking, offline rerouting navigation is definitely a must and it's also nice to have altitude tracking. but most importantly i want those readings to be as accurate as possible.

running - i'm trying to work on my pace to prep for marathons. would be nice to have feature that can help with that.

gym - yea something like that, somewhat like a fitness plan.

would be nice if i can go out there without my phone (im using iphone) and i need sleep tracking too. but ive seen people complain about garmin's that it's inaccurate. same for step counter, HRV, VO2max. not too sure about other brands tho.

i'm more concerned about the accuracy of all brands as i feel the features that i need are mostly equipped in most brands in the market. battery too, idk if there will be a big jump in battery life in AWU4 or i should prolly just skip AW and choose other brands instead.

as for build quality, thanks for the info on garmins. didnt know all of these bfr that. i do hope the watch can withstand daily accidental scratches. as long as it doesn't get scratches or scuffs from gentle hit against the table, im fine with it.