Optimus Prime is one of the strongest Autobots out there and he can actually match up against Devastator. Devastator is much larger than Prime, but Prime’s weaponry can damage the titan and he has speed on his side. Flying is a great bonus as well and if Devastator can’t win, Scrapper doesn’t stand a chance on his own. His merged mode just won’t be enough to beat a Prime! Optimus Prime wins.