Different kinds of underwear look better on different men with different builds. I always thought slender, smooth twinkish types looked cutest in straight up briefs, Bel Ami type swimmer jock guys in boxer briefs, true muscle hunks in jockies/straps, and frat boy / chill straight bro' types in boxers. I'm just now realizing how complicated my system is.
For myself to wear, I'm partial to boxers. They slip off easily, there's a nice loose hole (no peeling layers of cloth apart) in the middle that it's hot to get a blowjob through, and they don't hug my junk too much.