Racing games.

I checked my collection and had a hard time placing some games, or some would fit half and half between 2 genres. (for instance I first had FPS and Action+TPS as 2 genres, I could have had shooter and "other action" though)

Anyhow, racing is definately dominant... even combining all Action + TPS + FPS + SHMUPS (top downs like Galaxy Wars) into one big "Action" category still falls just short of racers.

I think I can definitely say that no one genre overtakes another in my collection. I would probably default to saying RPGs, but then there's 50 action and platformer NES games to counter my RPGs. And then all my PC games which are all simulation, shooters, adventure and FPS. So..yeah. I just can't come up with one dominating genre.

fps and rpg.