I know I'm probably really boring but I have always worn briefs/y-fronts. I'm not really sure what the difference is between briefs and bikini briefs.
I wear bikinis. Theyre more form fitting and snugger. Keeps everything in one place and from flopping around. They also dont have a fly.
Boxers and boxer-briefs. I was exclusively the former until some birthday/christmas presents of the latter hehe. At first they were binding and they still sometimes are, but I've come to like boxer briefs a little better.
Boxers were always the way to go for me. I like the non-confining feel of flopping around, especially during the Summer time. I hate how they can bunch up sometimes though and can end up pinching the package - but the good still outweighs the bad.
:dry: ...thongs. bikinis. If it were cishet normative, it'd just be boxers and briefs. Good lord. If you don't wear anything on the list, just make a note. Anyway. I'm a boxers and boxer briefs kind of guy.
Boxer briefs - always. I hate the way regular boxers feel in my trousers, especially if I'm wearing skinny jeans - too baggy and loose. Plus, boxer briefs are hotter.
I'd say boxer-briefs/trunks 75% of the time, and boxers 25% of the time. Depends on my mood and what I'm wearing over them. Tighter or more constricting shorts/pants require boxer-briefs; if the shorts/pants are loose, I can go either way. On my boyfriend, I love boxer-briefs/trunks. He's pretty well-endowed, so they are super sexy on him and leave barely anything to the imagination