I'm looking to order either one of these, but am not sure what the real differences between the two are. I am contemplating also purchasing a Foam Cannon that comes with some DP shampoo, but would eventually try whichever Meg's shampoo I decide to go with once the DP is depleted. Which Meg's product would be better suited for the Foam Cannon? In the event I don't get the Foam Cannon, will there be any noticeable difference between the two when washing conventionally?