I have both and like both. But at today's prices I'd definitely choose a cheap AK. I got the SKS at least 6 years ago when they were going for $150 or less and today they're close to the cost of a WASR-10 which surprisingly hasn't changed that much in price.
My SKS is a Yugo and weighs a ton. If you go with an SKS consider a lighter one.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek