Both make quality knives, IMO. I have a Kubey, lower cost knives by KB, and a couple of Vipers. I like the clean look of the Viper more, but it only has one opening method which is minor downside for me. If COO is important to you, choose the Viper.
Interestingly, the Viper Wing is designed by David C. Andersen of KnifeCenter videos fame.