A few months ago, like before the Thiago Silva fight, I was picking Rashad via decision; not sure now, though.
I know that Rashad can likely dance around 'Page all night, picking his shots and scoring points, but I'm not sure how successful Rashad will be at taking Rampage down. If he's unable to, I don't know if he can survive 15 minutes without being KO'd. I mean, Machida KO'd him. Silva damn near KO'd him; those were Rashad's last two fights. If those two can do what they did, 'Page sure as hell can knock him out.
Rampage's problem will be that he's not very fast, so I don't know if he can catch Rashad. However, if Rashad is unsuccessful in taking Rampage down, he'll be open for a big shot. We've seen Rashad gas a bit when he's going for a lot of takedowns, especially if he's not successful, so he's likely to slow down a lot in the later rounds.
On the flip side, though Rashad can hit hard, I don't think he can hit hard enough to put 'Page out. Rampage has only really be susceptible to knees in the clinch, something I don't think Rashad is good enough at to use against him, so a KO of Rampage is highly, highly unlikely.
A lot of variables is what makes this fight interesting to me. I'm not too big a fan of either guy, so I really don't care who wins, but I am interested in seeing how it all plays out.