Does your buttercream contain butter? If yes, then I would go with ganache for sure. If no, then either option would be fine. I refrigerate all my cakes. Buttercream, ganache, fondant...all of them. I have never had a problem. Does the fondant cake form condensation? Yes, but it is only a little bit. Just don't touch the fondant until the condensation dries. Otherwise you will leave finger print marks on the cake.
5/29/14 at 7:37am