Predators have far more advanced technology. They are far beyond the levels of even Star Trek technology. A Terminator might be able to kill 1 or 2 Predators here and there in a war of Terminators vs Predators but overall, Predators dominate with ease.
And I'm not even sure if a T800 Terminator is that much stronger then a Predator physically. In hand to hand, no weapons I give the edge to the T800 Terminator. A T1000 slaughters many Predators hand to hand.
In a war where Predators can use their weapons and space ships, the Terminators don't stand a chance.
I wonder who wins an arm wrestling match between a T800 and that Berserker Predator in the Lawrence Fishburn Predator movie...
That Berserker Predator might fuck up a T800 in a hand to hand fight.. T1000 is the king of hand to hand fights though. I don't think any Predator can beat T1000 in physical combat. T1000 could easily kill an army of Predators if no weapons were involved. Even if the Predators had their spears and swords and wrist knives, they would still lose to T1000
Excellent question though.