Tekken was quickly bettered by its sequels and other 3D fighters, Doom II is awesome, but I prefer the original. Sonic 3 and Knockles is amazing, I struggled getting into Donkey Kong Country. Unfortunately never played XCOM, Super Metroid or Final Fantasy VI.
My favorite game of 1994 is actually Tempest 2000 for the Atari Jaguar. An amazing step up from the original, outstanding arcade tube shooter with trippy visuals and soundtrack. One of my favorite games of all time.