To be honest, neither matter a great amount to me. They both matter a little, of course, and I'd have to say looks matter more. Styles change (and to be honest I don't really care as long as they don't look like a total douche) but attractiveness stays, and attractiveness does play a role in, well, being attracted to someone. That's not to say style doesn't help - it definitely does, if a guy has good style it makes them hotter to me, and could also indicate that we have things in common, like music and stuff. You can tell quite a bit about someone by the way they present themselves, so it is kind of important.