I actually use red, green, brown and occasionally purple, all by Ocean Nutrition w/ added garlic.
My tangs will not touch the green unless they haven't been fed in over 36 hours, but the blennies and flame angel will scarf them down. My tangs prefer the red and brown, and I think that they look healthier, but that might also be due to the fact that they don't like the green that much. My coral beauty won't touch green sheets.
I don't think there is much difference as far as nutritional value, but I like to offer as much variety as I can. You should see how many different types of frozen foods I have. There is more fish food in my freezer than human food.