There are things that he Il2 series does better than AHII. However, the game only something I do occasionally do and will never be a competitor to AHII online because it is nearly ruined by two large flaws.
The first is the viewing system. Although not bad as sims go, it has nothing on AHII. With the AHII viewing system, once you learn to handle your hat-switch well, you can concentrate on flying the airplane and keeping SA. The "head" on snapviews also moves incredibly slowly. The "mouse" view system is better, if I could learn to fly while using a mouse. Presumbably, TrackIR would work the same, I am suspicious that the views in Il2 are DESIGNED to sell TrackIR. Arguably the adjustable views in AHII give you some vis at some angles you would not have in a real airplane, however, notions of "realism" in sim views must be tempered by the fact that in a real aircraft you can move your real head about in a natural manner.
The more serious problem is the instability of the aircraft. The nose of all aircraft basically bounce around and make incredibly unstable gun platforms no matter what you do with airspeed, and trim. I suspect this instability is to make people think they are flying a more "realistic" sim, but realism it ain't.
So in Il2, you are struggling to keep vis during most combat maneuvers, and struggling to steady up for a gun solution on even the simplest dead 6 shots. Whereas in AHII, after you play awhile, flying and seeing are pretty much there, and you can concentrate on out-maneuvering the opposition. And that is why for my money AHII is always the winner, no matter how much in the way of graphics, sound effects, or numbers of modeled aircraft Il2 has to offer.