Go for the AUG.
Much more maneuverable then the G3, plus I've heard the hop up system is better on the AUG.
Although you did say you don't care about how compact it is, you will, trust me.
I would recommend the JG AUG A3, very nice gun. Just replace the hop up, get a tight bore, nice 9.6V battery, and that's a nice gun.
-Griffin