Firstly, underwear is highly subjective.  I'd been wearing Land's End boxer briefs for many years, but as the diameter of my thighs increased (working out, not gaining weight) the legs became very tight and somewhat uncomfortable.  In a quest for a new brand, I went out and bought BVD boxer briefs at a local drug store and purchased Dockers and Levi's boxer briefs from Amazon.  The best brand winner was Levi's.  BVD's fly was too high and tight and these Dockers were too thin and tended to ride up.  They fit well around the waist, though.  I have a 32 inch waist, and the mediums fit perfectly.