Ok, ok, I know I can't really purchase either.
So I'm talking AR-15 vs whatever a Semi-Automatic AK is.
The reason I ask, is because Kalashnikov is setting up a manufacturing plant in the USA.
I prefer the AK look, the furniture, and the cartridges' reputation for reliability.
Thoughts?
Build an AR, buy a Vepr.
First thing: ARs and AKs come in a garden variety of calibers, but in general, ARs come in calibers based off of .223 and .308 and pistol calibers and AKs come in Eastern Bloc calibers like 7.62x54r, 7.62x39 and 5.45x39.
They handle differently. "Modern tactical" trainers and training emphasis hitting the safety with the left hand, which means they're default pro-AR. To do a left handed safety flick on an AK generally involves reaching over the gun. I always found it easier just to flick off the safety with my right thumb on an AK.
Standard AK furniture sucks to handle as a grown, American man. I'm not a large person, about 5'7, 150lbs, but I have long arms so regular AK stocks have a very short length of pull for me. I always max out the stock on a collapsible-stocked AR.
The answer is to shoot and buy both. A .223 AR can't have more stopping power than a 7.62x54r Vepr or PSL (I know a PSL isn't an AK) and a .308 AR is more powerful than a 7.62x39 AK.
But if you just want a .223 AR or a 7.62x39 AK, I'd pick the AK because I prefer the controls on an AK and 7.62x39 is a bit more deer hunting friendly. I know there are people who can use a .223 effectively for deer, just like how poachers use .22s. But 7.62x39 allows a bigger margin of error.
Note: a deer and human aren't very off in terms of weight.