We do know what race is best, and its not Goblin. If you have some actual numbers or testing to support your position, I'd love to see them, but at the moment it looks like little more than baseless speculation, which has no place on these forums.
While we still do not know a clear cut answer towards which horde race is best for us, I believe that it may be goblin. Orc was best last patch only by a little bit; however now with the ability to yield that MH dagger legendary (in COMBAT spec) the axe specialization bonus for orcs is somewhat thrown out the window. I would love to see some numbers to confirm this since I cannot really test this without paying to change races; however this is my opinion that at the moment goblin is probably slightly ahead of orc for us.