I got to shoot Serenitys AK and it was awesome. There were a couple things I didnt care for, but it was reasonably accurate, went bang everytime, and thats all that matters.
Hell, a couple of times it went bang when we WEREN'T trying to! lol
My $.02 on the AR vs AK, they are two VERY different rifles. Your high-grade AR-15 is VERY accurate, generally ergonomic, and a real shooter's rifle. It has tight tolerances to create this accuracy which also make it picky. Most AR-15s have certain ammo types they like and certain ones that will jam them up. A lot cannot handle steal casings rather than brass. They need to be properly maintained to shoot reliably, and excessive dirt and much greatly increase the risk of catastrophic failure. Your AK has very loose tolerances. It's not terribly accurate, and minute-of-man generally out at 100 yards. It's not built for long-range engagements of precision accuracy. Full-auto is rather silly as the 7.62x39 rounds without any type of buffer will guarantee only the first round has any chance of hitting it's target. It's a cheap rifle. However, I have yet to find a single round that doesn't feel flawlessly. I've only had a handful of FTFs, and that was the first few rounds out of the gun while she was still teething. I know no matter what happens to my WASR-10, when I pick her up and insert a magazine, she will always chamber, and every trigger pull will put a round down range, no matter what brand of ammo I use or where I get it. If I'm shooting at a match and want the best shots possible, or a sniper in the field, where i only have one bullet to make all the difference, I would take an AR-15 every time. But for personal defense, or any combat situation, I would prefer an AK. In the field, especially in a SHTF situation as a civilian where you lack all of the supply lines the military has, you don't know how often you'll be able to clean your weapon, if you'll be able to find lubricants, solvents, etc. There's a good chance you'll just shoot a weapon until it fails. I know an AR will probably fail before the AK. It's not a guarantee, but it's more likely.