You should try both out and see what you like. A lot of people (including competitors) like the sound quality of the W6v2 better than the W7, it's just a subjective matter, and of course others prefer the W7. Car audio and Electronics magazine rated the 12W6v2 as "the best sounding sub they'd tested", and that was after they tested the 10W7. I'm not saying the SQ of the W6v2 is better, I'm just saying that a sub isn't automatically better just because it's the most expensive or touted as their "flagship" speakers, you have to choose according to what you intend to do with it. The SPL of the drivers will be pretty close honestly.