Are you joking, right? FB is a nice offline sim, with a beautiful 3D engine. However, his CEM is full of bugs and the whole sim needs a ton of fixes. A patch is inbound but, as for IL-2, it probably wont fix all the bugs and inaccuracies. Why? Time is money and next 1C projects needs manwork.
AH's FM is, generally speaking and IMHO, much better.
Take a look at the SimHQ BBS and read what even former beta-tester say about FB and his FM. You really should have been a beta tester to understand.