sbk08 is a good motorcycle game, i bought it the day it came out coz it took so freakin long for a bike game to come out on ps3.
i personally like to put the settings on the most realistic simulation. its great with the new contoller triggers, u have much more control on the amount of throttle u can use, easing on the gas through the turn like ur supposed to.
also u can put it on arcade mode for the kids (if u actually have any lol)
dnt know if motogp08 will be better as i haven't played a bike game by capcom