Oof. You're making me think on this one. I don't think I can label them in a ranking system, so instead I'll describe my ideal scenario for each.

If the aim is for someone to be pantsed/otherwise humiliated, nothing does it nearly as well as briefs and panties, especially in public. Nearly the entire upper thigh is exposed, and they just look so dorky. Bonus points if they've got cute little cartoons on them or if they show just a bit of ass.

Bikinis and string bikinis I think go well when the guy is confident. Like, seeing someone not give a damn and strut their stuff is pretty fun.

Trunks and boxers are really cute for domestic things. Just going around the house doing chores or cooking. They're just intimate enough looking to be fun when one's doing housework. I don't know, they signify a level of romantic comfort that doesn't need to be sexual.

Boxer-briefs are great when one is cuddling with someone (trunks work for this too). They're compressed enough that you can kind of lay against someone and feel their nethers against you without having the desire to just yank them off. They're really nice for those soft, quiet scenes just before bed.

Jocks, thongs and diapers aren't my thing. Not shaming though! Just not something I'm into. If you are though, great!

And of course, you can't go wrong with wearing only a shirt. A slightly long shirt can go a long way to having your cute little furry rump showing when you get up to grab a snack, or having a nice view of the fluffy balls when one sits on the couch with their legs up.

I think that covered everything (though the subject matter didn't cover much)?