Shaun White is 12 pounds of crap wrapped up in ginger hair. IMO its one of the worst games this entire generation. Its a shame too, because the multiplayer design is rather cool. Its kind of like Burnout where you can go online anywhere in the game, but the game really sucks.
I didn't care for Stoked much either (its a mess in more ways than one), but its definitely better than Shaun White. If you have to get one, get Stoked.
Both are somewhat arcadey, but Stoked's trick system is much better.
Amped 3 is still the best snowboarding game on the system.