I don't have either but I really lean towards the AK. I have wanted a polish tantal with the wire folder for a while. I guess I'm drawn to how the AK design has loose tolerances to allow the weapon to function even when dirty.

I have heard a story from Vietnam of a special forces team finding a dead NVA solider who had fallen on top of his AK when he died and his body decomposed into and on top of the rifle. Apparently, they test fired the rifle and it functioned. That story was told by Larry Vickers (who is retired SF and now works for Daniel Defence I think) on a military channel program called weaponology.
The design just seems tough. It seems like much more of a battle rifle to me when compared to an AR, but there are accuracy issues as well. Also, I'm drawn to the generally cheaper prices on the AK platform.
Just my opinion at this point, not having either rifle....