I really don't think I'll be picking this set up. Don't get me wrong, they both look good and Mixmaster's new head sculpt is nice if a little on the cute side.
... You know, I think that Mixmaster mold with that head sculpt would be pretty cool if he were coloured as a Junkion. The alt-mode looks kinda similar to a garbage truck, so why not make him an ROTF Wreck-Garr?