Instead of focusing on just one case, in particular, take under consideration what your daily activities are, what your ideal aesthetic is of course if you have a proclivity to accidentally drop stuff much since these things will ultimately steer you toward the ideal path.
If you are the adventurous type, you'd need something weatherproof and practical so as to secure your mobile from an impending dip from a river or dull injury from stone. There is a handful of iphone wallets in the marketplace that offer many of them.
In case you lead a life span, this kind of case will still last well as you being inactive does not necessarily translate into a phone being immune to injuries.
But if bulky cases are not something, you are able to opt for folio-type services and products that can double as a pocket or slim-type types which readily slip in your pockets or purse.
There are products in the market that have a hardness variable, making sure that your device is safe from breaking up. Another terrific thing about such a product is the fact that it showcases your mobile's design better.
If you would like to indulge your creative side, then there are customizable cases available in the market as well. They don't offer good protection though, that explains why you still will need to be careful when handling your mobile phone.