As already noted, the biggest problem with AK47 is poor pistol-type sights for any kind of precision shooting. Far inferior to sites on any US service rifle, ever.
If there was an AK that fixed that problem,it would be very nice. But otherwise the AK can never hope to achieve the type of accuracy other rifles can. Of course, there is the Galil, which is the best AK.
AK-47 was designed for massive fire by poorly trained, expendable troops. You have to get within relatively close range for it to be effective, and 200-300 meters is not far at all when you are under fire. If you can move away to more like 600 meters with a 30-06 or 7.62, then you should do that.
I have tested representatives from both categories. Armalite AR15 is an awesomely accurate rifle (say 1.5" with iron sights). SLR-95 is also an awesomely accurate carbine (2.5" with iron sights), both with common non-match ammo. AR15 continues to be accurate further out than AK. They say AK-47 has a range of 300 meters. From personal experience, I do not believe this. It can put the round on target somewhere at 150-200 meters, but 300 is very optimistic, given its crude sights.
So the bottom line is the AR15 is a much better weapon in many ways, primarily that it is much easier to obtain hits with, the primary reason for hvaing a rifle. AK-47, on the other hand, is not designed for precision shooting, it is a carbine with 16" barrel. I would pick the AR even with its cleaning overhead. Gas-operated rifles are not easy to maintain, forces you to clean your action so often.
I do think that the AK-47 is a lot better for defensive purposes or where long distances are not an issue, and it is compact size is a bonus. Kind of like a better M1 carbine.
Of course anything in 7.62 is even better but rifles and accessories are really heavy, and you come back full circle wishing for a carbine.