Now, number 2. It's not a "weapon" until you decide to use it as such. Until then it is no more than a tool. An inanimate object.
Which is best? That's a subjective question. Everyone will have their own opinions. They may or may not agree with yours.
I like both the AR15 and the AK47 for reliability, utility, and ease of operation, as well as the ammo availability.
There is nothing wrong with the G3 other than it's heavier to carry and more expensive to feed.
With the old-school triangle hand guards that's probably an M16-A1 with selective fire full auto. I'd sell it then buy 10 Daniel Defense ARs and a crap-load of ammo. Or maybe 2 Rock River Entry Tacticals, a bunch of ammo and a Honda Civic. The Civic is the Glock of cars after all.