What is the most common worn male underwear?

I have 3 male friends their ages rages from 20 to 25 and they ware boxers. I have another Male Friend who is 22 and He wares briefs. I am 40 and I use to ware briefs and now I ware either Boxers or Boxer Briefs. I like the Boxer Briefs a little better because when I ware Boxers I feel like I get hot down there so I ware Boxers in the winter and boxer briefs in the summer. I guess you could say Boxer briefs breathes (allowing sweet to wick away).