I'll give the SKS a little leeway on accuracy, but I wouldnt say its WAY more accurate. I have a Russian SKS that shoots about the same as my Saiga at 100 yards.(keep in mind, the AK's also have shorter 16" barrels. My Saiga is only 14") If anything, the advantage of the SKS is probably the slightly longer sight radius. Both rifles are at the mercy of the ammo they are fed. With good ammo, they both do well.
I dont think the slight accuracy advantage out weights the AK's mag capacity, reload speed, ease of carrying ammo, or available "issue" and practical accessories, etc. You can "try" to make an SKS into an AK, but why bother, the AK is already well past what you'll end up with. Most of the aftermarket SKS "upgrades" are lacking to downright useless. By the time you spend your money to figure it out, you'd be close to having a converted Saiga from Krebs or AK-USA.
Ammo is probably the biggest issue for any of them, as far as accuracy goes. The difference between a good lot and a fair lot, can be quite substantial. Find one what works well and load up. Wolf is pretty much hit or miss, and not the most consistent. The old Barnaul, which I believe is now marketed under the Silver and Brown Bear labels, has always been the most consistent and accurate for me, and especially the 125 grain SP's. I never saw the need to reload for the AK's as ammo was always plentiful and cheap, although thats changed a bit. Still, I dont know that its worth the effort and really all that much cheaper, as components have gone up just like ammo. I suppose if your a tinkerer, and trying to wring every last millimeter out of your groups, it might be worth it, but for me its just not practical.
