I think in my climate (and of the APS Gold Medal peonies that I grow), Peony 'Bartzella' and Peony 'Old Faithful' take the cake. Both of their blooms are gorgeous, plus they stay great looking well into late summer. Peony 'Bartzella' is an intersectional peony and has lovely giant yellow blooms. Peony 'Old Faithful' is of a much smaller stature, but grows beautifully and has red blooms of a color that is hard to find.
Peony 'Myra MacRae' is one of the floppiest peonies I have ever grown. If you want this one to grow without lying on the ground, you'll definitely need supports. Peony 'Salmon Dream' and Peony 'Many Happy Returns' both have foliage that disappears. However I think the blooms on Peony 'Salmon Dream' make up for its foliage, and early dieback is expected as with most peonies with a coral color. However Peony 'Many Happy Returns' really disappoints. Its flowers are nice, but the foliage is always diseased and dies back way too early for a peony of this color. This is a recently honored APS Gold Medal winner (2007) which really mystifies me, considering one of the qualifications for the APS Gold Medal is "good plant habit and good foliage throughout the growing season", which this flower does not seem to possess, at least in my southern climate...
Peony 'Salmon Dream' | Peony 'Many Happy Returns' |