This is like trying to pick one caliber. Can't be done. I suppose that if I only had one gun, it would most likely be an AK. I love the versatility of the AR-15, My favorite caliber is .45 Colt, I'm a devoted 1911 fan and I carry a Glock 30 every where I go, but if I had to narrow it to one, I'd pick an AK because it's handy, it works in all conditions and in all weather. It's large enough to kill a deer and it's accurate enough for my eyes. Fortunately, I don't have to choose.