Well to further add I think while SC2 definitely has more depth due to its system of play, F-Zero is the better single player due mostly to challenge and mastery of the courses.
The A.I. racers can get pretty rowdy but jumping and aligning your ship just right with the track while at the same time heading off the opposition, banking, bumping off other vehicles, managing your shared turbo/energy, trying to stay on track all factor in for a crazy ride.
They both have a ton of stuff to unlock and all but I don't have too many people around to play SC2 much let alone letting them play by themselves to get the nuances of the game. Again I love them both but due to the nature of the games and the GC in need of quality racers makes F-Zero GX more deserving of my attention right now.
