I actually had to vote SMAW. The quicker draw time of the M320 makes me prefer using it to kill people over both the SMAW and RPG, while if I need to lock on to something I'll use either the Stinger or Javelin.
The XM-25 doesn't really compare to the rest in my opinion. It's a great weapon, but hardly something to compare to the stinger or RPG.
Gabe: Reality has exiled you, you are no longer bound by its laws. - HoboSpartan