I do know that boxing dose alot more damage to the brain than MMA. In boxing a knockdown happens you go to the corner and you come out agian to take more abuse. Boxing lasts 36 mintes compared to 15 minutes in MMA. Im MMA a hard hit happens and the man flops to his back its usally over with a couple more blows, the damage is done no more shots.Plus MMA guys arent taking 250-400 punches to the head and body every fight. MMA guys are taught to fight in all aspects. Boxers are taught one thing and that is the art of a punch ,how to deliver one, how to take one, how to aviod one. I belive over all Boxers have the better chins. I would take Ray Robinson chin over Mark Hunts anyday he had over 200 fights and was only and was only floored a handful of times. You can say the same thing about Hagler and JCC. I respect the MMA,but when it comes to punching boxers have it.