After seeing this:If you intend on displaying it with Classics Faith Leader is the better choice as MP Prime 2.0 is the same height as MP Rodimus.......who's quite a bit taller than Faith Leader so won't really work the Classics.
I'm leaning toward MP10. I don't collect Classics (in fact, I sold the bulk of my Classics collection a couple of months ago), and I only display MP and Alternator figures. So, looks like this will be better in relative scale. Also, I like that he's a bit different from the figure I already own. But if I run across a Faith Leader for the right price, I might not be able to resist
At this point, they've gotta do a Megatron, as well. Would suck to have all the other figures roughly in scale to one another, but only a giant Megatron.