The last thing to consider in the buttercream vs. ganache debate is the palate of the person you'll be serving the dessert to. A classic American buttercream is about as sweet as you can get. Ganache tastes like biting into a luxurious chocolate truffle and doesn't hit with the same level of sweetness (via America's Test Kitchen ). There are
Gelatin or another stabilizer, yes. And mousse is generally flavored (and sweetened) - while whipped cream can be, it doesn't require those additions. A mousse is basically a Bavarian cream or chiffon that is lightened by added whipping cream and or meringue. You can add gelatin to help stabilize, but if you add too much it will toughen it.
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