The better combat rifle is in the hands of the more accurate, more situationally aware, quicker reacting combatant.
I'll take an AK personally because I've gotten quite bored of shooting M16/ARs from the military, I get a huge "Whoopty doo..." Factor when shooting an AR these days. Also because cleaning a direct gas impingement weapon sucks, my M1A and AK take about a quarter of the time it takes me to to clean the Marine Corps' M16A4s.
Those are my reasons, the AK is better FOR ME. Not better, just better for me.
Sgt. of Marines, 3rd Award Expert Rifle, 237/250
1st Award Expert Pistol, 382/400
D Co, 4th CEB, Engineers UP!! OEF 21JUN-20SEP2011