Women seem to liked boxer briefs best in my exerience. I think there are simple reasons for this. I like boxers myself. I sometimes wear boxer briefs too.
1) They like seing the goods and boxer briefs show them off better than boxer.
2) Tighty make you look like a pre-teen or a dork
3) And a speedo/thong? Don't I need to even bother explaining what's wrong with that?