Hi, I have the peach and coral drift and love them. They stayed clean all summer last year, which was my first year with them. The peach one has the best scent ever. The clusters of flowers on it are gorgeous starting with the buds and ending with those precious little blooms. My coral one didn't seem to have much of a scent from what I remember. My peach one is about 2 1/2 ft. tall by 3 1/2 ft. wide. The coral one is staying smaller but it was alot smaller bush when I got it. They have quick rebloom but I wouldn't say it was continuous like the knockout. I have a bunch of knockouts too and nothing is as continuous as it is. Good luck deciding. Judy