Definitely the WS55 in terms of pure bass, but the Crossfade has a more balanced sound IIRC. But, I also remember the WA55's only good feature being the bass; the Crossfades are bass-heavy just not as much as the WS55. I haven't heard the V6 though, so I can't say if they'll have more or less bass. I'd imagine more, seeing as V-Moda is typically a consumer brand.