IMHO Boxers FTMFW...
Briefs just feel constricting. Boxers leave room for...advancement? (not sure how to put that in a P.C. way.)
And boxer briefs just make me sweat a lot in that general region for some reason.
None of them feel like thongs. Trust me on that. (No I won't go into specifics..I was with my fiancee and there was Jagermeister involved...I still must get those blackmail pictures from her...>_>)