I loved both of them quite a bit. Zero 2 dash or whatever it was called was good fun, but I never put as much time into it as I did Alpha 2 (mainly because I had more or less played the game out by that point and just bought the SFCollection for shits n grins), but I thought it was a really nice port all over.
SFZ3 was good too, though the sprites were resized and some frames were cut. Again, didn't dump as much time into it as Alpha 2, but that may have something to do with there being too damn many pointless options for each character. Like anything other than Z-ism for Fei Long, for example :(