Really difficult to decide... but I prefer then the first person shooters in the Prime Trilogy. Enough though hard to focus on at parts. I like looking through the visor. I do enjoy the side scrolling games but I just enjoy the visor.
Platformer. I'm sorry, but Metroid Prime was always so hard for me to navigate in, I always got stuck on certain parts, and it's alot harder to trace back then it is on the others. And the bosses, I always lose in lol. =P