Not really sure, but seems like W3 would have a good amount of bass, but smearing over the rest of the spectrum, even if it's a minor thing, and ends up making for an enjoyable listening experience. IE8 seems to have slightly less bass than W3, but has a more balanced sound.
I'm not understanding, are you looking for full sized headphones and IEMs?
No, the IE8's have more bass :P!!! i mean thats what i hear everywhere?