Ya know, I'm not a big fan of either SFII or MK. Hell, I'm not a big fan of fighting games in general. I find their gameplay stiff, uninspired,
and limited.
Easy one Street Fighter 2 it was much more fluid and had more strategy than Mortal Kombat all Mortal Kombat really had going for it was the finish him
effects and gore.
Street fighter 2 is still one of my all time favourite games I think it pinacled at Super Street fighter although the later ones are fun as well.
when i was 13 i used to go down to the arcade after school and play the original SFII and got so exited when champion edition came out cause you could
play as the bosses. also had SFII-Turbo on the SNES. and i'm still playing various steet fighter games on emulators on my laptop (with a logitech
controller)