Deep V. Here's why............................. Unlike carpets there are no fibers in the deep v mat. So you get a more active exchange of material, active meaning that the lighter materials easily wash out of the channels while the heavies are retained. What happens in carpets is that most everything, light as well as heavy particles that are small enough to wedge into the carpet fibers become trapped and soon the carpet gets saturated with those particles and becomes packed solid. Once carpet becomes packed solid it no longer can trap gold and you must stop and do a clean up. Also it's much harder and more time consuming to clean all the particles out of the carpet plus you end up with way more concentrates to process than with a mat whether it be deep v, vortex, gold hog, or any other rubber mat on the market. Here is the catch....... deep v is great at retaining fine and small flakes of gold up to about 1/8" but anything larger will just roll across the tops of the v's. Same thing with vortex and other mats with small areas to trap gold. The good news is that you can modify the deep V as well as the vortex mat to capture larger gold, by simply removing a row of rubber every 3-4" inches for the first foot of mat creating a few 1/4" drop riffles that will hold the larger gold. The reason for doing that for only the first foot of mat is because all larger gold will drop out within that first foot. With gold hog mats I'm told that they will trap the 1/4" gold with no modification necessary. Miners moss has the same drawbacks as carpet but will trap larger particles, that is until it becomes packed solid. Go for the gold GG~