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id say sidious too. a predator is good at hunting and stealth stuff but sidious would sense any danger through the force. the acid blood wouldnt be much of a factor, sidious is either using his saber which will seal the wounds, lightning that doesnt seem to draw blood, throwing it around, or throwing things at it, which will keep it at a distance. predator either lurks around not knowing sidious can sense it with the force or tries a frontal assalt and gets enough lightning to put it down permanently. hed probably hold the alien in midair to neutralise it when hes not throwing it around so he can attack the predator. it does depend a bit on how much research on him the predator has done though. sidious will still take it, but will have to be cautious rather than just unleashing like he did with yoda in the senate arena.
Sidious takes this, if uses all of his resourcefulness, and takes advantage of the environment. If his future sight told him about how to win that would be a plus. Sidious is very clever and he has the dark side which allows its users to never tire out. So sidious has a pretty good chance of winning if he fights intelligently