I own several SKSes and a stainless Mini-30. With a single notable exception (a Chinese "commercial" SKS) average accuracy is a toss-up. With the stock magazines, so is reliability. Aftermarket "high-caps" are another matter in both. IME, one has to go through a sizeable number of them in order to come up with three or four reliable examples in both flavors.
The Mini with its shorter, lighter barrel does seem to open up the groups a bit more and sooner than an SKS with extended rapid-fire, but so what? You're not going to take either varminting down in Prairiedog Town, it doesn't really matter when plinking, and if you're in a real firefight you have more pressing matters to worry about (like having it go "bang" every single time it needs to, "how much ammo do I have on me?", and "how can I "GTFOH" with my skin intact?").