It seems that HTC team focuses on gameplay & fun factor, rather than overall realism of the sim.
And it shows. AWACS type of radar, current hit sprites, simplified damage model, simplified engine management, ammo indicators, questionable 6 view, auto trim, auto take off etc. are very far from reality but serve their purpose in increasing gameplay.
The result:
After couple of hours AH H2H I am having fun. I only remotely feel being a part of some WW2 engagement, instead it feels like some "shoot 'em any way you can" with wings. High fun factor, some things are even funny (weird collision model, for example). But the game has departed from realism.
After couple of hours in Il-2, however, I feel exhausted. Constant scanning of the sky, constant IFF lookout, managing your engine, ammo. Very intense and demanding sim. Attention to detail is incredible (try to attack an enemy truck column - drivers jump out of vehicles and run for cover).
So, if you are looking for fun, go AH. If you want realism, go Il-2. IMO.