For shooting, M16 over AK
Because I am a civilian, clean my guns once in a while, and the AK doesn't fit me. It has horrid ergonomics for a man of my size, and just not so good generally as the AR for position of controls, trigger pull, sights, and overall accuracy. I also like the gun to lock open when empty.
Both rifle can jam (I have had AKs jam, its reputation not withstanding), and the "vulnerability" of the AR to dirt is vastly overstated. You do have to clean it to keep it running right, more often than most AKs, but I am not an ill trained peasant from beyond the Urals.
Current production M16s and their ammo are not what they were in Vietnam. They are a lot better. AKs have their advantages for military use, and their flaws as rifles. M16s do as well. If I had to go to war, and had my choice of rifles (not carbines, or 300 meter submachineguns) I would not choose either one. But when you go to war, you don't get to choose, you get what they give you, and do the best you can.
As a civilian shooter, neither one is the best you can get, for any specific application, so what does it matter? With the AK you pay less than the AR, but except for bore size, you get less.