Imo the most defensive proc is the lvl 71 arcane aegis. (Attack is the best defense sometimes :P)
Glin aegis is awesome weapon at aggro imo and ofc doing some dmg same time compare to other warrior weapons but at maus sometimes is annoying cause mage curse. And Glin aegis is awful for pvp imo u need stack attack to crazy proc and thats hard at pvp zones mostly op against mobs and big pulls.