Boxers are better for both men and women, and are attractive for both of them. I wear boxers, and I far perfer them to constricting briefs. Briefs are stupid, and they shouldn't even be around anymore. Comfort needs to take precedent to outdated ideas of style and health. Boxers forever.
If I had to pick one, I would choose briefs over boxers. Briefs are more designed for comfort, and help reduce chafing, which I know first hand is no fun at all. Briefs are also better handled during physically activity, such as running. They also fit more snugly, allowing more present ability.