Depends really upon whether you are a man or a woman who wants to wear the male underwear.
For a woman, I would say that there are distinct advantages, as the "pouch" shape at the front can be useful for storing all sorts of handy items; from loose change, lipstick / mascara to your mobile phone (left on Vibrate naturally). Please ensure that any ring tone chosen is appropriate to your phone's resting place. The embarrassment caused by "the birdie song" emanating would be more than most people could bear (it brings a whole new meaning to thrush sufferers everywhere). Obviously the use of loose fitting boxers would negate any of the advantages previously discussed.
As for men, it's a simple answer - once again essential wear, otherwise there'd be nothing to catch the skid marks or any other mistakes; which would mean far more frequent washing of trousers/jeans etc. This would never do as we're all committed to saving the planet and minimising water usage / detergents etc.
Wear your pants and save the planet- tree huggers of the world united against "commando". (Though admittedly you'd never have a problem with VPL)