I'm not a lady, but I am going to chime in because I like to meddle where I don't belong
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I don't find underwear on men a turn on by I have an aestheitc appreciation for good looking clothes (in this case undergarments). So I would say: If a guy doesn't have much of a build (body) definitely boxers because they hide more. But if he has a good build, i.e. good legs, abs, chest, and arms then definitely boxer briefs, because they enhance a "good" body without being as "revealing" as regular briefs . . . things tend to hang out when wearing regular briefs . . .