FWIW, the Poetic Atmosphere is a nice case but extremely hard to take off. I also wonder about the durability of the piece across the bottom front, as it's just a skinny piece of TPU with no support at all. It just feels like it might be prone to tearing, but I could be wrong.
Never used a Candyshell Grip, but I have used plenty of "normal" Candyshells & loved them all. Very sturdy. I always felt like my phone was safe when it was in a CS.