I owned both at one time. The SKS is a bit more complicated but mine never had reliability issues. I could be a bit more accurate with the SKS which I always attributed to the better sights but I realize now that I was also staging the trigger as well. The SKS's trigger is pretty awful. Ultimately accuracy is about the same because the thin barrels heat up enough to open your groups after 15+ rounds.
The SKS was more comfortable to shoot, mainly due to weight (mine was a Yugo). Not fun to carry for the same reason.
Ultimately I sold the SKS because I wasn't shooting much of either at the time and my AK was a little more handy and bomb-proof. They both fit the same niche.