First off, my experience pertains to the 5s. I have owned 3 of the 4 cases mentioned. My favorite is the Magpul Bump case, followed by the Otterbox Symmetry.
The Speck Candyshell scratched too easily and broke out around the lightning cable port rather quickly. I replaced it with a Speck Mightyshell and it was a very nice case, didn't scratch like the candyshell and didn't break either. It just added too much bulk to the phone and was so tacky on the edges that it made it difficult to remove from my shirt pocket.
The Otterbox Symmetry was very nice, offered great protection, was nice and slim not making the phone bulky at all and was smooth enough that you could remove it from your pocket with ease, maybe was a little too smooth. Quite frankly, if i wasn't such a case freak and never tried the Magpul Bump case, I would probably still be using the Symmetry.
The Magpul Bump just wound up being my favorite. It offers great protection, is easy to put on and remove, is rigid so that it offers strength to the phone, and is just the right compromise in offering good grip without being so grippy that you can still easily remove it from your pocket. It is also made in the US which I really like.