So, these:

(agressive, wheels are smaller and they're slower, for stunts and shit)
or these:

(inline, bigger wheels -hence harder to drive?- faster, for racers)
I dont know to ski, dont know to ice-skate, I havent ridden any type of boot with wheels before. Which one should I buy? I am a biker and motobiker, but I wanna get these just for occasional fun.