mixmaster is the better option but i would pick both. but mixmaster is awesome in bother modes and looks awesome as a robit! (ZOMG ROBITS!!!11) Mixy all the way
I love my mix master. especially robot mode. in fact, i love robot mode so much i haven't transformed him but twice even though alt mode is great too!
Rampage is Transformers Marmite - you either like him or not. Personally I'm not so fond. He's grown on me a bit though. Like a yeast infection. Ransack is cool little fun though.
I just ordered my 2nd Ransack. 'nuff said. I am skipping on Rampage and the Constructicons. gonna get the EZ collection Devs next month, though. that's my 2 cents