They're both nice enough to use. My pick would be the peach as it's the direct complement of the blue and therefore is able to hold its own against the very busy floral print. I feel like the green is too similar to the background of the floral and while it definitely brings out the green tone in the floral's background, it also fails to give a place for the eye to really rest as it moves across the quilt. So I would have somewhat of a preference for the peach -- but they both look nice.