Since 2005 I got my VH4 I placed mine in the sales section.
I do not want to sound rude, but check your setup's health and wiring if you really consider that you need one. This is a wonderful n.gate, but I do not really see a need for one as in live conditions you rarely need to get your rig to be dead silent so the small amount of extra noise is OK.
But to also answer your question and not just being a smart-ass, I had the mono unit and preferred it in the serial loop due to being more efficient to control highly distorted tones.