LOL i think that would be the MGL.

I'm only using IEDs on certain maps. Sometimes i'm using them with the dart rifle. after i find a good sniping spot i usually plant that thing nearby, which means that everyone who wants to come closer
in order to blast my ass, dies.
lol suicide bombing is not my favorite thing to do (sometimes i do that too, but only if there's no way out)... if there's a troop coming towards me i'd rather use the MGL or the RPG. BANG, troop mowed down.
SAW is very useful against squads of enemies, too, but if more than 4 people are coming, it's gonna be a bit tricky.
Still, my favorite tactic is stealth. The dart rifle is my favorite sniping weapon, cause nobody will figure out where the shots are coming from.