All SKS rifles are fun and cheap to shoot. It’s a good buy for <$300, but don’t expect it to perform like a $1000 gun, even if you add optics (and why would anyone do that? It’s like lipstick on a pig). The yugos are not any better or worse than other SKSs, but if you use comblock ammo you have to clean them with water because the bores aren’t chrome lined. We all got in the habit of ignorng our Norinco SKSs, and they never sufferred for it, but the yugos will darken up in a jiffy unless cleaned well (rinse the barrel out with hot water, then swab dry and detail clean and oil as usual. Don’t neglect to rinse the gas tube, too.)
There’s really no good reason to use old, corrosive military surplus ammo in your SKS. New production non-corrosive ammo from Sellier& Bellot (Czech) or Wolf, Bear, Tiger (Russia) is plentiful and cheap. It’s steel case with berdan primers, but your SKS chews up brass pretty badly, so that’s not much of a handicap. Same goes for your AK.