As stated above, by allowing you to adjust the debounce and anti-mechanical independently, you can set your trigger to be right on the verge of bouncing, without actually getting to the stage that it is obviously, and illegally, bouncing. That may give you a slight rate of fire advantage in semi auto.
In all honesty though, if you had absolutely zero bounce with both boards, then there really shouldn't be any difference. If one trigger pull = one shot fired, then as long as neither board is adding shots due to bounce, or taking shots away due to excessive filtering, then both boards should allow the marker to fire as fast as you are pulling the trigger. If that isn't the case, then it isn't really true semi auto, and there is something wrong with the settings.
The Virtue board is a good board, and there are a number of reasons that you might want to buy one, but there is no way that a board can actually make you pull the trigger faster than you do already, and if the trigger isn't bouncing - or the debounce/anti mechanical bounce filtering out some genuine trigger pulls - then the rate that you are pulling the trigger should be the only thing effecting your rate of fire.