What is the best decorating icing to use for piping on cakes?

As far as taste I love the buttercream decorators frosting the best, but after researching the piping, it seems you might want to try this Royal frosting. There are 3 different types on the link below if you look in the upper left hand corner. I've read all the reviews and people say this is what you use for that "cement" look.

allrecipes.com/Recipe/Royal-Icing/Detail....

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