There are 5 main male underwear types worth knowing about and I'll run through them without the waffle. Briefs: minimal, supportive, best for heat and fitted clothing. Trunks: shorter cut that sits above the mid-thigh, the everyday all-rounder most blokes land on. Boxer briefs: longer leg, more coverage, good for sport and active days. Boxers: loose, breathable, no real support, suits some blokes for casual use. Long-leg trunks: extended coverage for colder conditions or extra comfort. That's the full map of male underwear types in plain language.
What I think matters when you're choosing between male underwear types is matching the cut to your day rather than defaulting to habit. A bloke who wears the same style for every situation regardless of what the day involves is probably not getting the best outcome from any of them. I know blokes who've worn boxers to sport their whole lives when a trunk would have served them significantly better. A small shift in thinking about which male underwear types suit which activities makes a real practical difference.
A good example of matching the cut to the context: I had a mate who did outdoor work in summer and wore boxer briefs year-round. He was consistently uncomfortable in the heat. I pointed him toward briefs as 1 of the male underwear types better suited to hot conditions and he tried them for a week. He came back and said it was the most comfortable he'd been on a hot workday in years. Simple change, significant outcome.
From my experience, understanding male underwear types doesn't require much research. Try a couple of different cuts over a few weeks and your body will tell you what works. Barramundies makes quality versions of all the main options so you can test them without compromising on quality and muddying the comparison. Start with a trunk if you're not sure. It covers the most ground for the most blokes in most situations.