I like Ground Force. Only because it's a completely original, unintended gamemode that was discovered. It's fun blasting people out of the playing area. I wish there were more Survivor/Ground Force levels.

From the choices above, however, I chose CTF, Test, Coop, Team Battle.

I like tests if I'm in the right mood for it. Otherwise, they're an annoyance.
I like CTF because it's fun working as a team I guess.
I like Team Battle, usually. Depends on who's playing. But it's not as chaotic as battle.

Coop is fun because working together is great!

Race, I only like if it's a test race, like the foo races.

As for other, there's also Onslaught. Still to this day, I have no idea how Birdie did it, but that original gamemode and level is still amazing.