I was about to post a similar thread. Pardon me if I chime in as I have a AW3 and wanted so badly to love it. It had cute faces, and is aluminum, with cell capability. I paid ATT for an extra "line", but prior to buying didn't realize how much the AW relies on being tethered to my iPhone, which is HUGE. I wanted to have that Dick Tracy fantasy solution. It was, sort of, but as I have read in my more recent research (through various threads) the Bluetooth headphones, GPS tracking while you are doing your activity (my case walking or riding bike, some swimming) can burn the battery out quickly. I am very slow, walk about 3 MPH, ride my bike maybe 10 MPH, so if I want to do a 20 mile ride, with stops, and listen to tunes, I worry the thing will die on me and I'll "lose" that workout if I'm using RideGPS or Strata. I have had 'it' die on long walk/jobs (I used to do 22 miles every third Sunday once). So, is the 6 battery life any 'better' in these scenarios? Is the software any different than what I can put on my 3? (I am recharging my 3, which has sat idle for two years, to see if an update will recharge my enthusiasm for the AW in general).
I know the never watches have is it EEG? Cardio monitoring now. I did go to Apple's site to compare, but the linear features lists don't really speak to me, which may be the OP's problem, as it is mine too!
I'd throw money at the problem, if the 3 model bump would make my life 'better'. Doing long slow walks and rides for hours on end listing to music and not having to carry my iPhone 12 MAX is what I'd see as an improvement. Maybe someone can also paste in favorite threads where features and APPS that make best use of the devise for those of us who may not have used the system for years would be nice too? Sorry to hijack. Just curious myself