Curious what After Burner 2 is like, I really enjoyed the first one on the 32X
I got to play a copy from Black Tiger, and its really exceptional for the hardware - though I don't think it outpaces the Saturn port or the 32x. It is really fun! The controls are not too shabby, which for Afterburner is pretty impressive (even the Saturn port has a few minor issues: namely being unable to use the shoulder buttons to control speed unless you use the 3D controller). Though the lack of buttons can be a pain.
I think Space Harrier fares the best given its purity (I've been meaning to get a card for myself). IIRC there are a few minor things lost in Fantasy Zone, but otherwise that is good too.