The Chinese guns-- especially the early guns 1956 through the mid to late 60's are every bit the same fit, finish and quality of their Soviet counterparts. With the exception of the wood use for the stocks, the Chinese Type56 is an exact copy of the SKS 45 made on Soviet equipment and, until 1959-60, produced under the direct supervision of Soviet technical experts.
Late Chinese guns from the late 60's onward are-- for the most part --- equally as good. However from around 1970 to 1977-- while China's main SKS factory (arsenal 26) shifted production to the Type63[edited] assault rifle-- the bulk of Type56 production in China was spread out among many smaller factories. Many of these factories were largely consumer oriented production facilities-- not originally focused on sks production. With so many smaller factories producing the Type56 in smaller quantities, it is not uncommon to see a large variation in finishing quality and overall quality of workmanship between the rifles from this period.
If you can, stick with an all matching early gun with a screw-in barrel (short lug or long lug).
I'm not familiar with the "chrome is less acurrate" argument. But the SKS was never intended as a DMR. At best it will give you consistent 3-5inch groups at 100. Over time, the chrome lined barrels will wear better and give you better lifetime accuracy than steel barrels which simply wear out faster. Regardless of how clean you keep it.
What the sks was designed for is minute-of-man accuracy out to 250-300 meters. And it does so phenomenally Ive owned up to 22 sks variants at one time (down to 13 now). Currently I've got 2 Romanian, 5 Soviet, and 6 early Sinos. I've shot them all. And there is no discernible difference between the overall function of any them. The most accurate SKS I've ever had is a mismatched, 1970 dated, short lug carbine from a low production arsenal /6166\. It's the only non-matching sks that I still own-- and the only reason I kept it is precisely because it shoots tighter groups than any of them--go figure. One day soon I want to mount a rail of a PU or PE type mount and scope on it.
For a dependable shooter, with all things being equal-- between a Chinese and a Soviet variant -- its a draw.