I can tell you that the EVOs sound incredible. It may not look like it has a lot of bass from the charts on the website, but you can definitely get it if you want it. I want to try the X2N. It should be great for any bridge pickup activities that require distortion, but I wouldn't count on it having much of a clean tone. If you go for the X2N, you'll probably still be able to get a Vai-able sound, as amps, effects, settings, etc. are more important than pickups. Personally, I would probably go for the EVOs, but I don't think you can go horribly wrong with either pup.