Well I needed a wristband to run with my phone because of a few near drops when running with it. So Amazon is usually the logical place to go, but my phone is the Moto X Pure Edition, and its a BIG phone. That being said, my choices were somewhat limited. The top two are linked below, but one is a case that holds your phone in a nylon pouch of sorts, and the other is a specialized case that you must put your phone in to attach it (Fittense).
At first glance, I really liked the concept of the Fittense as it allows rotation - alas, there were several reviews indicating that the Fittense is only for larger arms, and my arms are not. So I went with the JOTO - and I'll be retuning it, even as much of hassle that can be. The problem is, the clear plastic cover wreaks havoc with the Moto Sense active display and tends to stick to the display, so really, this will be an issue with any smart phone. It's unfortunate because it did fit well both on my arm and on my wrist. Oh well, I guess I'll just hang on to it for the time being.
JOTO Armband
Fittense