Best killer in my oppinion, the PIAT - No smoking gun, most intuitive aim-sight, deadly enough for most tanks, favourite sound effect, idle animation (only one with a unique one for Normandy actually) and reload animation
but for the hell of it, my fav for gameplay will be the sticky bomb - Its just cool to run up to a tank and 'stick-em'
sure, you need a number to take out any decent tank, but you got 3 at all times... and the technical aspect is cool too, how it looks, how it works.etc... and it leaves most tankers confused as to the direction it came from.. till its too late
that's commando-stuff, baby