there are a few questions that we may need to address before we find out, which would be best for you. i own both and will try to help you out as best as possible.
I bought the ak, actually the wife bought it for me when i was in Iraq, but I always wanted one so therefore i got one. I have a mak-90 and absolutly love it, i have never had a single problem out of mine, it is great, and shoots pretty darn good. i like it primarialy because it has a high capacity capabilities, and has a nice pistol grip.
the reason i bought the sks is because it is lighter weight, a little more handy, and the 10rd internal mag makes it alot easier to shoot it from the bench, and there are no big mags to get in the way. I really like the sks and i think that they are the best all around semi auto rifle, in there price range. they are cheap to shoot, they eat anything, cheap to buy, easy to dissassemble, and one of the easiest guns to clean, they shoot pretty good and can be worked by about anybody, with no gun knowledge to all the knowledge in the world. very simple. and 10rds is plenty of ammo, for about any situation, that you will find your self in.
I hope this has helped you! good luck in your hunt for a rifle.