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! CAPS LOCK! I DON'T CARE! ALTHOUGH I LIEK DYNAMIC THOUGH BUT ARENA IS BETTER. Oh caps lock finally turned off. Anyway, I hope Halo 5 is an Arena shooter not a COD rip-off. I hope it has a similar art style to Halo 2/3 (mostly 3) too...