3V is going to give you a whole lot more toughness, and CTS XHP will have better corrosion resistance. I'm not sure about edge retention, although I suspect 3V might have the edge. I've only used Cold Steel's CTS XHP, and it is some really good stuff. A real all-around steel and plenty durable. The 3V I've used was not Cold Steel's, but it is an amazing steel in its own right.