I played all but the second generation twice, and in those playthroughs it wasn't who I did choose, but who I didn't. That namely being the grass type. I hate grass types, I really REALLY do. Empoleon in the new game is a beast, but can be annihilated by Infernapes fighting moves. Torterra, on the other hand, can likely be dominated by both of the other starters (Empoleon's ice and flying moves, Infernapes fire moves [duh])