If I knew I would be stuck in a crappy environment and not have the opportunity to properly clean my weapon, I would choose the AK.
I agree that the M-16 is a precision weapon, but like many precision tools, it is not as tolerant/forgiving to bad hygiene as the AK.
I shot the M-16 at 300 meters on the range. That is not the range I would want to be in a combat situation.
It took a lot to get a hit on a man-sized target at that range. But at 100-200 meters, I would not mind the AK.
I would rather carry an M-16, but shoot the AK.