I'm going Mario Kart. I played Link's Awakening, and it has one huge flaw... there's a point of no return. Yes, little 3rd grade JGlass was on the last dungeon in Link's Awakening, well on his way to waking the Wind Fish, when he squandered his last small key on the wrong door, which he later learned would be his downfall. I've never beaten Link's Awakening, and I never will, and it's all because of that god damn point of no return.
Not to mention Mario Kart 64 is just a better game. As Dagger said, Mario Kart was THE multiplayer game, and for many it still is. Has any game aged better than Mario Kart 64? It's still a common site to see Mario Kart 64 tournaments held in college dorm rooms, and not one child of the 90s is unfamiliar with the game. Link's Awakening, on the other hand, is one of the more forgettable ones of the series.
Vote Mario Kart 64.