I've grown both flowers and the colors are very similar. In my climate, however, Joan Derifield is a much superior performer. JD is a prolific bloomer and its flowers are bigger than those of SR. JD has much sturdier scapes and great branching. As with many Munsons here, I didn't get many blooms from SR. I'm not sure I even grow it anymore.

Chris

Joan Derifield is definitely the superior plant performance wise.