AK is legendarily reliable, rugged as all hell, and has an almost unlimited aftermarket with relatively cheap accessories.
VZ is lighter and points easier, simpler in design and more robust in construction, but the aftermarket is a bit more limited and mags are pricey. Kinda uglier than the AK and doesn't have that awesome cla-clack when being charged like an AK.
For my money I'd go with a VZ. Oh wait....I did.
But honestly, it's the type of thing where I'd just want both anyways.
Century VZ2008s aren't of the same quality as a CZ/D-Technik VZ, by the way. Even though people say that they're "good for being by Century" I'd still avoid, cause that's not saying much.