This technique for smoothing buttercream developed by Melvira is very popular here on CC: http://cakecentral.com/article83-Quick--Easy-Smooth-Icing-Using-a-Roller-Melvira-Method.html
I think it's all in the preference of the customer. I don't get too many requests for fondant for the icing - buttercream and cheese cream icing are my two standbys. I do use fondant accents, but don't do too many all in fondant.
For the smoothness miriels suggestion of Melvira's method is great. I use a combination of the Viva papertowel, a roller and a hot spatula. LOL Sometimes I have to use all three to get it right! LOL
my favorite frosting to use is a crusting cream cheese recipe i have. it's not to sweet and gives that comfort cream cheese flavor, and you can decorate with it. i've posted it in the recipe section. i always get requests to use this one.
This is my favorite BC and it crusts so you can smooth with VIVA or use Melvira's method or whatever works best for you.
http://forum.cakecentral.com/cake_recipe-1948-Butter-Cream-with-real-butter-for-decorators.html
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