I prefer the look of wood myself. Of course it all depends on what it is. A double gun, be it an OU or a SxS should have nothing less than a good piece of wood on it. But for a meat gun, a black synthetic is hard to beat. If you use the gun long enough, a camo gun will eventually become either totally black, or first, almost totally white. Very faded and hand worn. Camo guns look worse with time, black sythetic guns look the same always, but perhaps magnify wear on the metal finish, and wood guns only look more and more classy with time.

Just depends on you really.