For performance, the AR would be better. But I am comparing it to a .22 AK I had earlier this year which I sold. The AK can handle much more dirt and crap compared to the AR right? The AK I had, I didn't clean it for the first few weeks of owning and it fired flawlessly.
I don't think when you're talking .22LR that you're going to get the same reliability advantage in the AK over the AR. They both run completely different action systems in the rimfire variants as compared to their centerfire big brothers.