The AW is accurate enough for me.
I have a Garmin 410 with a HR strap and a bike speed/cadence sensor. I could add other ANT+ devices like a Quarq or SRM power meter, foot pod, etc., but I never got that deep into it.
After a few years with the Garmin, I realized that I didn't care much about the quantity of data it accumulated. If I were cross-referencing it with my body weight, dietary intake, different bikes, race results, and things like that, it would have helped -- but all I was doing was staying physically healthy and keeping fit, not trying to win my age group at the next sprint triathlon.
Because the 410 is bulky and has zero smartwatch-like functionality (I'd call it a portable exercise lab monitor that happens to be wrist-sized), I don't wear it much. After the newness wore off, I never wore it as a daily-wear watch, either.
Fitbit-style bands: I've never bought one. They feel very cheap to me, my cousin and her husband have had to get theirs replaced multiple times because they fell apart, and their limited functionality doesn't make them interesting enough for me to wear regularly.
What the AW is for me is a good enough exercise logger, a good enough activity tracker, and a very good smartphone extension. It's also comfortable to wear and reasonably aesthetically pleasing, which helps me feel good about wearing it daily.