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Well I would say that if they are the same price I would go for the 6 bulb LOL if you don't need a couple you can turn them off... If you are going to be doing some light loving SPS then I would probably go 6 and even if you don't need them now when you upgrade you will be happy you have the 6 bulb light.
Well if you have both the one with the moon lights sounds like it would work for the tank and you would have your spare one for a future upgrade. I personally would probably not trade a 6 bulb for a four bulb... If you are thinking about trading I suggest you look up the replacement costs of both and go from there.
keep the 6 lamp, the 4 is just a waste since the LEDs moonlights are mainly for show. with multiple power cords you can hook up digital timed power bars to simulate a dusk and dawn can allow the lights to stay on for a normal cycle