The best white I have ever worked with was known for years around here as "Dottie's White Breeder" -- later named by Dottie "Frozen Mert" - it is the parent of Gossard's Heavenly Angel Ice. It is a dip.
I don't care much for white flowers, of any kind, not daisies, peonies, roses etc.
So, I can't help much. Sorry... But, Frozen Mert is a good one!