I like them both - I particularly like Wheeljack's huge moustache. I suspect one or both of the lines on his 'faceplate' is actually his mouth.
I don't mind the 'nerdy scientist' look. I think the variety of body types in Animated is something of a balm in fact. But good or bad, stereotypes often help to convey information about a character quickly without the need for lengthy exposition, and it's not actually offensive (it's just an egghead and corrective lenses). And they're probably not 'corrective' so much as some super-extra-science-view glasses. :)