Metroid, because I simply like that kind of game better. I'm not big on racing games in general, I only like a few and of those, I only liked most of them for a very limited amount of time.
F-Zero was good though for what it is, I have both the SNES and N64 game. It is however a series I could live without. Metroid on the other hand has multiple classics, each very original and unique with the potential for so much more. I'd also rather have a new Wave Race than F-Zero.







