Which mens underwear is better Boxers or briefs?

Definitely boxers.

It depends. They are both night and day apart.

With briefs, they are designed to support whereas boxers are designed for a more natural state (no support).

Then, there are boxer briefs, which, depending on the manufacturer, can either be really a brief with a longer leg (like a boxer), or a brief that has the fit of a boxer that still looks like a brief (with a longer leg like a boxer). Complicated, isn't it?

Which is better is just a matter of preference. Try all three and see which is more comfortable overall as each style has their good and bad points.