First off Dynamic, I don't know what other term to use except for class based, but it'll do. Dynamic are games such as Halo: Reach, Halo 4, Call of Duty, or Battlefield.
Secondly, we have Arena-style games, this is like Quake, Halo 1, 2, and 3, or Unreal.
I've got to go with the Arena shooters, I like being set on the same ground as everyone else and your true skill (or rush to the weapons) will show.
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Arena. Seriously. The multiplayer is dying out cause everyone wants progressive multiplayer for unlocks. I miss Arena shooters where everyone is the same, pickup weapon gameplay, and powerups. Buuuuuut noooooo...everyone now has to follow the trend of class-based/loadout gameplay. Such a shame...