Hiya Drache! Good to see some WB players from south of the border.
Flight model: I don't know much about this stuff except in Aces High the jug doesn't roll like a jumbo jet and I can reproduce a lot of the moves I've read Gabby, Zemke, Johnson, Mahurin, et al did in the AH P-47. The WB P-47 is a fly straight or die type plane and no fun to fly IMHO. Based on that one aircraft and being a jug fan, I prefer AH.

Views: AH's system for configuring views is far more flexible than WB, however I think many AH planes are too generous with six views and the dead six view in AH (aka Linda Blair effect) is unrealistic. WB has a very nice system which slows down your view panning under G load and you cannot go checking 7 oclock to 5 oclock passing through 6. The WB3 cockpits are nicer than AH (when they get them right--the WB3 razorback jug gunsight position was porked, positioned right behind the center canopy bracing!), but the WB view system is so limiting--why make 3d cockpits if you can't move around and see around cockpit bracings?? I go with AH for superior all around views/cockpits.
Community: On both this board and AGW, people tend to say their community is better than the other. I dunno about all that--I think some people just get comfortable where they are and don't want to leave friends, which is understandable. The "community" is basically the same here as in WB, as far as I can tell. You've got some good opponents, a bunch of nice fellas, and "tards" in both places--there's just a little more of everything in AH.

Overall graphics: AH is simpler graphics wise and as a result plays faster on more people's machines. This is a good thing. I can focus more on killing the bad guy than noticing my slow frame rate. The WB graphics are very nice though and allow skinnable aircraft--soon online too. That is a big plus for WB in my book.
Strategy: Strat is a little more advanced here in AH. WB strat hasn't changed a whole lot in
forever, but AH is continually developing new strategy features.
Updates/Support: This brings me to probably the clincher in this deal: AH is updated regularly, and not just with bug fixes. We get new planes and variants about every 3 to 4 months and new strat features. WB3 development has been glacially slow and was a big reason for me coming to check out AH. Also, AH has far better support. Have you ever heard of a game developer calling up a customer on the phone after a new release to track down a bug? Happens here, and the bug was fixed within a day or two. Also, HTC's new support guy is on the ball--email response time inside 1 hour! HTC is keeping their product fresh and doing all the right things to keep customers happy.
Drache, check out the
events here in Aces High. We've got scenarios a plenty here. The TOD series has events Friday night and Saturday afternoon. You can fly as a guest if your squad isn't big enough for regular membership. Welcome to AH and I hope you enjoy your stay!