Answer: The Royal Burgundy might be a bit slower as it is more compact overall. In the long run I personally think the smaller maturing Royal Burgundy would be the better choice. This is a low maintenance shrub that requires little if any pruning, ever, if there is space for it to reach its full size. With the Cherry Bomb's larger mature size you would have to prune a couple of times a year to keep it from scratching on the window and blocking the view -- thus creating an unnecessary chore. Pruning also ruins the natural shape which is pretty symmetrical all on its own. But, it is really up to you if you like the look of once better than the other.
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