Briefs are not good for men. They hold everything too tightly, and up against the body where they should not be held for long periods.
Perhaps some wouldn't care, but the extra heat generated by having your balls up high and against you kills off large amounts of sperm. No big deal, perhaps, but consider this...anything that'll kill off the sperm inside your body can't be very good for the surrounding items.
You should wear loose-fitting boxers, let your testicles hang as nature intended. Let your "boys" be free.