Regarding the launchers, aside from shooting at air vehicles, I can't find a reason to go with anything but the Law. It's only a few less damage points vs the RPG, but it reloads basically twice as fast. The Sraw sucks cause you need to guide it all the way in, then reload.
I can't see the video Shmoopy posted, but love to know what the exact damage amounts are along with reload speed. Guarantee the Law reload time gets nerfed next patch.