I'm a Reflex fan when it comes to helis on a sim. I tried G3 and didn't care much for it (but that's just me). AFPD is suppose to be a pretty good sim, but from everything I've read, Reflex is the best sim for helis. The only downfall of Reflex is you have to have your own radio.
also do any of them have a trex model in it?
It's been a long time since I used my Reflex but I'm pretty sure it has 3 or 4 different T-Rex's.