Which Transformer should be bought Devastator RotF or Jetfire RotF

Both are really great. But if you had a choice, I'd say Devestator. The only problems with him are the fact that the mixmaster vehicle reacts to anything if it moves. For instance, if you sit next to it, it makes an annoying sound. And despite the rumors, Devestator doesn't transform to a vehicle, and the vehicles themselves, (Mixmaster, Scavenger, Scrapper, Long Haul, Hightower, and Rampage) don't transform to robots. Otherwise, Devestator.