I personally like to use a white print when I use white fabrics. Especially in quilts that use a lot of white. I just like the look of it more. White solid just seems too flat to me. Then again, I don't really go for solids in any color. If I have a colored fabric with a lot of white in it I do try to match the whites as much as possible, but again I think it depends on what design you are working with. It is all about your personal preference. There is no wrong answer.