Definitely trunks. I second the call for equality, I think that thongs should be banned for ladies in the same way that speedos should be banned for guys.
I'm all for confidence and I applaud men and women who dress for themselves and feel good about their bodies BUT I also think that guys (and gals) should leave a little to the imagination. I don't want to see the sexiest hunk in a speedo and I don't want to see the most beautiful model in a thong. Just my opinion though ; )