MK is my favorite by a long shot. I played MK 1 for 2 yrs straight every day and MK II owned my soul (best MK ever!) The babalities and friendships were a little overboard... but still fun nonetheless. MKII started getting too advanced on the combos, but Kabal was awesome. MK4 is where the fun ended for me in 3d land. I really miss doing the Johnny Cage uppercut on my opponents feet when they're jumping in at me...lol.
SFII Turbo was really the only one I enjoyed out of all of the SF games.
I know this doesn't really fall into the same league, but another one of my favorite fighting games that was revolutionary imo was Killer Instict.