There are some incised cuts that are probably easier to accomplish using a "V" tool, but most incised carving should be done with different sweep gouges just like you do raised carving of the same design. You get smoother curves using incremental sweeps. Also the cuts don't tend to be as wide as with a "V" tool. I do use a "V" tool for cuts for which I don't have the right sweep gouges , but I have also used it where I wish I had tried harder to do it with matching gouges. The main reason being that that cuts ended up wider than I would have liked.