Looks like I need a third one.

Seriously the transformation! The chest, the thighs, and the feet!

I think it's the comprises that the TT designers have to make make them come up with much more elegant designs than the 3p ones. Most of the 3p Megatrons try to have the chest panel actually transform like the G1 toy did. TT ditched this idea altogether so the upper body transformation is so much more stream-lined, and symmetrical too.