Renee,
I have used the blender pens on both Confetti White and US White. There is no question that the US White is the BEST White CS to use - I have tried them all. But the blender pens should work on either CS. In fact, confetti white is a great CS to use for watercolor, blender pens, etc.
US White and Vanilla are the smoothest, so they may be more resistant to pilling; but try the technique I suggested first; if you still have problems, pm me and I'll try to help you!!