There are Y-fronts and then there are briefs, old man Y-fronts are kind of hilarious but things like these, http://www.tqsmagazine.co.uk/wp-content/uploads/2012/06/david-beckham-underwear.jpg are far from old man pants.
Boxers can be comfy but you still get tangled up in them sometimes, they disappear up the crack of your ass sometimes too. Spontaneous wedgies are a nuisance. Well designed briefs keep everything in order but shouldn't be to tight. I cant really vote, I do not wear Y-Fronts but I do not wear boxers either.