The AK has so-so accuracy.( although you can buy, at a premium, Finn/Western made ) The AK ballistics have a real drop in them vs the flatter shooting AR. The round isn’t quite as devastating as the AR. It weighs more.
Both are good...enough.
I’m on the AR side of the fence.
AK's, manufactured in Romania or Bulgaria after they joined Nato shoot the 5.56 which give you higher muzzle velocity, less drop, and slightly better accuracy. Although even the Russian 7.8 version is not bad out to 250 yards which is about as far as I can see.
There is also a higher toned version AK which shoots 5.56 Nato which is also manufactured in the Nato Eastern Europe countries copied after the Finn/Russian Spaznetz version which is much better made and purportedly is more accurate further out--issued to snipers. Asking price on those is $1000; I have offered $600 but so far been unable to buy.