Direhorns and Devilsaurs

Hi i have a question because i'm playing bm hunter and with Direhorn as pet i'm dealing around 170k dps and with Devilsaur 130k. I think it is strange because Devilsaur is exotic pet and Direhorn not. Do some hunter can tell me if this is normal or some bug.

Well,dinos gives u crit and direhorns are tanking pets,but u can truly test them by puting them on dummy for 1 min,without u attacking,cuz it can proc trinkets,etc,so i preffer dinos :-D