Blast Attack for me. He always use to intrigue me as a toy. I never actually got the mini comic when i got the toy so I read that much later.
But I think he'd win easy. None of the others have the ability to reform them selves & we saw how easily Roboto was taken out by Modulok & Multibot by Skeletor in 'Horde Prime Takes a Holiday'. One explosion should be enough to finish the two up, at close range that is.