I play Infinite Flight and I love it. I haven't ever played Aerofly FS... but looking at the description it doesn't sound as good as Infinite Flight. From the sounds of it Infinite flight seems like it has more airports, planes available and from the screen shots of Aerofly I don't know if I would like the interface, in Infinite Flight its a HUD interface. I think Infinite has about 6 planes that come with the app and you can purchase 20+ planes. As for the airports it only comes with 1 or 2 area's that has 15-30 airports in the areas. I have purchased all of the planes and airport area's, so I'm not sure what all it comes with when you download it.
I am curious to hear some reviews on Aerofly FS...