I'm keeping my accounts active in WB, AH, and WW-2onLine to help fund development and competition in all of these sims, but mostly to have fun.
AH has a much more complete strategy in their sim , plus steerable CVs and lots of other ground and water vehicles with user-controlled guns, ranging from 8" to 50-cal. There is definitely some fun and satisfaction in learning how to fire an 8" gun that can destroy other moving ships and bases that are more than 5 miles away.
I have seen some criticism about the AH cockpits because of their non-historical look and layout, but I love their cockpits because all the important instruments are VISIBLE, READABLE, and you can set up your head-position any way you want, to come closer to real-life instrument and outside visibility. This is an all-important feature that makes all of the aircraft in AH more flyable in ACM. WB-2 aircraft had good cockpit intstumentation also, but I consider WB-3 instrument placement and outside visibility to be a step backwards.
I was somewhat annoyed by the AH map clipboard untill I learned how to properly configure and use it. I also love being able to configure keyboard and stick settings while in flight.
Their flight-recorder is an incredible tool for reflying a mission and learning from ones mistakes.
The Aces High kill-buffer does not say who-killed-who, and I miss the humor, elation, humiliation, and competition that this feature promotes in WarBirds. Even though AH player statistics are superior to what WB-3 offers, I really miss being able to call up the statistics of my last sortie in AH
The AH flight-modeling is much closer to real life aircraft that I have flown: very similar to the T-37, which has WW-2 performance, and direct-manual flight controls. The ME-262 reminds me of an underpowered B-737. AH power-off glide and landing characteristics seem much more realistic than WB flight modeling. Neither flight models seem totally accurate because no matter what I try, I can't get any of these aircraft into a prolonged inverted spin.
At this point, I believe that Aces High offers more features, and has more forward momentem and regular improvements than any other online flight-sim.