I've never been a fan of tacticooling either the SKS or the VZ/CZ. The stock barf wood CZ is a heck of a lot handier to shoot than the SKS. I shoot my CZ in stock form and enjoy it for what it is. Accuracy is fine with chec surplus. The balance is excellent, detachable mags and a safety I actually prefer over my AR rifles. But for optics etc... Just buy an AR.
As for shooting the SKS vs CZ.. The trigger on the CZ is a much nicer striker fired system. The safety is awesome, the balance is excellent, the receiver is milled and the barrels on the CZ858-2 non restricted aren't Crome lined. They are essentially CZ527 barrels. Excellent for accuracy out if this type of rifle. The VZ58 semi auto from Marstar and I believe the CZ858-4 (restricted) were chrome lined. The CZ is much nicer to shoot than the SKS.
Once you start changing these rifles around the cost goes up significantly and in many cases you're trying to make the rifle something it wasn't designed to be. If you want a 21st century firearm then buy one. If you want a 1945-1950s based firearm then SKS and CZ are good examples.
I own a non Refurb Russisn SKS and a stock CZ858. I greatly prefer my 858.