I've worn briefs since I was out of diapers. I like to have something fairly snug and secure holding in my assets.
briefs: . . . - chafing, showing off contents pretty plainly (which may also count as an advantage, depending on your age, gender, religion and general pov)
Reminds me of the old joke (stop me if you've heard this one) about the rock musician who says to his tailor: "I keep telling you, you've got to make the pants tighter! I want them tight enough to show my sex."
The tailor replies, "Bubby, if they were any tighter, they'd show your religion."