Well I think most agree that Heavy Rain is a tougher sale but also Heavy Rain has been hyped for a couple of years now. Epic Mickey has had a GI cover and some talk before it about its existence. If that continues, Heavy Rain will easily crush its sales due to lack of hyping and marketing for the other. Of course I would hope Disney would market it as a big game on Wii, but given track record of Wii games before this, I wouldn't be surprised if they didn't.
For now I'm going to go with Heavy Rain, but as for potential, the potential of sales for Epic Mickey exceeds that of Heavy Rain but its just whether or not Disney wants to pursue those. Considering I'm still picking Heavy Rain, shows you how much faith I actually have in them haha.








