Pole position for single player.
Super off-road for multiplayer.
I also love non-traditional driving games like APB, Lucky and Wild, Crazy Taxi, Spy Hunter and Rally-X.
As far as Cruisn vs SF rush....it is tough....Crusin had a sort of "theme fun". Even if the games were not the greatest control wise, it held itself up well at the time. SF rush was a game you could sink your teeth into a bit more as a serious game. I would probably go with a crusn because it is so recognizable as THE racing game of that era.