I've never tried either, so am not sure. I was going to use the whipped cream buttercream recipe from this site, which looks like a meringue type icing.
I've only ever put fondant over Crisco-based BC.
Anyone ever put fondant over whipped, fluffy frostings?
Yes. I put it over SMBC.
Your fondant will melt if you put it over whipped cream frosting!