Black is my favorite color because it is easier to keep their face clean looking. It's a personal preference. I heard that some show circles prefer a clean crisp white. There are several whites, parti colors, and abstracts on the forum that are absolutely gorgeous!
One thing to keep in mind about poodles is that their color tends to change as they lose their puppy hair. If you are planning to show and color is going to be particularly important, research your breeder and the genetic testing they do for several generations. Even dominant colors can produce several variations.
I am getting a companion puppy, so I'm more concerned about health and temperament. I do think a qualified breeder will help you get the whole package.