I have tried both. Out of the box, AFP Deluxe (or even just AFP) is much better on physics, especially if you want to do 3D. Now what I don't know is if Reflex physics can be improved by making adjustments to the planes. I flew the large scale Katana on Reflex and fould that it snapped out of the 3D manuevers I tried. By the way, the physics are just as good on the AFP as they are on the Deluxe for most planes. The difference is Deluxe has the abiltiy to make the small planes like Shockflyers fly like the real thing. Also, Deluxe has the photo backgrounds (which don't have an invisible wall behind you like Reflex). Good luck!