My question would be what do you really want its primary use to be?
As others said, the Simonov designed carbine has been made by many different countries. Russian ones show some of the nicest machine work, as do the Yugoslav versions. Some Russian versions had no chrome lining, some had chromed bores but non-chromed chambers. Yugoslav versions that I've seen have no chrome lining. Some Yugos have grenade launchers some don't. I prefer a non-grenade launcher version if the SKS because I've seen the gas cutoff valve move and prevent cycling without being intentionally shut off.
For a shooting gun I like the Chinese versions because of the chrome lined barrels and chambers. There were old military issued Chinese SKSs brought in during the 1980s and early '90s that were rough looking but still good shooters. Then the Commercial Norinco versions became the most common. I prefer a chromed bore and chamber for surplus guns because if the possibility of shooting corrosive surplus ammo in them. Also a lot of 7.62x39 ammo uses mild steel jacketed bullets and the chrome bore will improve barrel life when using these harder jacketed bullets.
Weak points if the SKS design are the intermediate piston that can break, and be tough to find a replacement for. On grenade launcher equipped rifles the gas cutoff can be a weak link in both self cutoff or breakage and replacement. Mounting of optics can be a problem, as the rifle was not originally designed for them. There are replacement action covers that have scope mounts, but retaining zero after disassembly and reassembly can be a problem. Triggers are military grade and can vary greatly from rifle to rifle in creep, travel and pull weight as well as grittiness. Consistency if manufacture is another factor. You ask how accurate they can be, but accuracy can vary widely from manufacturer to manufacturer and individual rifle to rifle because they were mass produced for volume and not for precision. Ammo is your other weak link. Manufacturers are numerous, and quality varies a lot from manufacturer to manufacturer and even from lot to lot.
Depending on what your primary goal is for the gun to accomplish the round may be lacking in precision, or power at ranges past 200 or 300 yds. It is generally weaker than a .30-30 in energy, because the majority of loads runs at or below .30-30 velocity and use 123 gr bullets that can have as bad or worse ballistic coefficients than .30-30 bullets in the 150 gr weight range. Most hunters limit their shots on deer to 200 yds or less with a .30-30 if they don't want to chase the deer a long way past the 200+ yd head start they began with.
An SKS can shine as a brush hunting gun for small deer and hogs in thick woods where ranges are going to be 100 yds or less.
Accuracy I have gotten with Chinese and Russian SKSs with chromed bore have been as tight as 1.75 inches at 100yds for 5 shots to not being able to get groups tighter than 6 inches at the same range. That was due to ammo with one particularly accurate Chinese SKS that shot both the best and worst groups. The Russian shot a bit more consistent but I never fed it that horrible batch of ammo. Best group was 1.8 inches and worst was 3.5. (These were all attempts to get good groups from a sandbag rest in a bench, I have shot worse when standing and just blasting away for fun).