For me it had to be trilogy,all the specials, combos, and levels made it unpredictable,even with people who weren't so good at MK could have good matches with an experienced player.Most of my matches had both characters at danger, then someone won by an inch, the music gets your adrenaline up, the special moves, jumps,ducks,and puches seemed like it was all planned from the beginning,like a movie almost.Most matches left everyone i know(even the kids at my school) with faces like this every now and then,.Hands down, i think trilogy had the best battles.