I dont know when they did the normalization, but i do know there is none yet (and wont come in vanilla).
I tamed and leveled several pets to lv60 and wrote down their baseDPS, however i will not make that available yet because I can, at this moment, only talk for my previous server and do not know if it's the same here.
But it is safe that different pets have different DPS and attackspeeds. And here is, when everything works correctly on Elysium, Broken Tooth king.
BT gets picked for its baseDPS in PvE and for its attackspeed in PvP - that simply is the case. If you believe that or not is up to you.