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My favorite, is plasma, because the frags are only good for a large group of hudled enemies, while the plasma sticks, and kills everything in one hit. (exept for hunter)
i like the frag because it explodes faster. does more damage than plasma gernade( when plasma is not stuck on sombody) and you can bounce it around a corner and blow people up.
definitely the frag grenade. I love close range combat (as you can see by my signature) and out of all the times I've used grenades, frags the best for me. I use frag grenades to lure my enemy into a trap. (If I want them to go left throw the grenade to the right of them) If I did that with a plasma grenade, I couldn't do that, because they'd go around. I'm also good at timing better with the frag grenade. So definitely the frag.
I like all 3, cuz I won with all 3. I use Frag as a shield when I'm rushing, and for around corners, and stuff like that, plasma for close up to stick to people, and rocket for everything else!
Frags are the kings of explosives in multiplayer, so I have to give them the proper respect.
Frags are just more useful. I love infinite grenades in MP.