A solid color tire will be softer and quicker wearing than a tire with a black stripe, no matter what. So by choosing a solid colored tire you are choosing style over function. Even companies that make solid colored tires will tell you that. This is from fyxations site.

"Colored tires are not new, but have been growing in popularity. Because colored tires do not contain carbon black, they are softer than black tires and therefore wear faster and can offer greater traction. Currently the Session 700 is made in black, white, green, pink and orange so you can pick your own flavor. However, because the colored versions of the Session 700 do not contain carbon black and are by nature a softer tire it is not recommended to use them as a skidding tire."