I have both wintry sky and crowned heads. This was wintry sky's second year and the flowers are just stunning:
Crowned heads looks exactly as wintry sky. I can't tell them apart:
My wintry sky bloomed really early. It bloomed at least two weeks before crowned heads did. Although I am not sure if it had to do with the fact that this was the first spring for my crowned heads so it may not have performed at its best or bloomed as early as it normally does. I love both of them! If I have to pick one I will pick wintry sky based on the reviews from others.