Till now I have had red/cream coats and don't find one is any better that another, I tend to use human conditioners if I want a coat to calm down quicker for a show and I don't have a week to wait for it to happen naturally.
My newest girl is black/cream, my first 2 tone dog.
You can buy a red shampoo at shows(can't remember off hand the name and I don't have my red boy any longer). Fantastic stuff and well worth the money as it brings out the red in the coat. I loved it.
I like Chris Christensen's Gold on Gold shampoo best for red coats. I've tried a few and that one brings their coats up best, and really makes them gleam.