I have both.
SKS is 7.62 x 39 (same as the AK)
If you want an SKS, look for one that has been modified to accept standard AK47 magazines. The stock SKS mags are a pain in the ass.
10/22 is a ton of fun. I bought a stainless one years ago. The folding stock ban had just went into effect, but my buddy had one and we ended up trading my standard synthetic stock for his folder.
I put a laser sight on it and sighted it for about 15 yards.......the sight is useless in full daylight, but plinking cans at dusk is a ton of fun (and cheap).