Uh, lets make it the Old Obi-wan.
I’d say the Terminator would beat the Predator.
Predator has superior agility and speed and can avoid being shot at a distance, but his personal cloaking device and forearm mini-nuke would be detected with Terminator’s enhanced visual accuity.
Also, Hyper-alloy Combat Chassis which makes up Terminator’s Endoskelleton could concievably absorb a blast from Predator’s shoulder cannon: the wrist double-sickle would be irrelevant.
Iw will end up being a toe-to-toe, mano-a-mano brawl, with terminator’s superior brute strength to punch the Predator’s skull flat.
“Hasta la Vista, ugly motherfucker.”
Blade vs Spawn