I think if you were into fighting games in the mid-90's, then you were probably either in the MK Kamp or the VF Camp. Simply because the amount of time to learn the hundreds of moves, combos and finishing moves, plus the quarters invested was too great for most people to do on more than 1 game.
Plus the fundamental difference between one game being 2d and the other 3d. This is only if you wanted to be competitive with other folks of course.
Personally the place I was working at, at the time, had a MKII machine so that is what I played, played it until I could pull off every fatality in my sleep. When my friend said "hey, you have to check out this new 3d virtua fighter game!!!", I did go and play it, but it just didn't do it for me.
When they got rid of the MKII machine and got the new MKIII, I once again relearned all the moves, but something about it just didn't seem as fun as II. Not sure if it was a worse game, or if it was just my own sense of sentimentality, but my favorite will always be MKII.