You definitely want to use thin consistency. Anything else, you will be struggling with crumbs or pieces of your caking dropping off, and you will not have an easy time icing it. I use thin, like most pple have suggested here in the past, and I never have a problem.
I always have a thin to medium consistency. I find that if my frosting is too thick it tears my cake. And things just snowball from there. But if it's too thin, then I have a hard time with the final look.
I think it takes a while to find the right consistency. I know just by how my frosting looks in my mixer and how it's pulling away from the sides and the whipping blade.
It's also wise to take into effect the environment you are in. Is it dry air or lots of humidity? That will effect your frosting as well.
Good luck!
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