I got 2 S-shaped TPU cases. I first got a red one and then went with white because it matched my phone better. While the white case looks nicer with a white phone, I would not purchase a TPU case in white ever again. Just from taking my phone in and out of my jeans pockets the case has gotten blue all around the edges. I've even taken the case off and cleaned it but personally I'd rather not have to do that all the time. So far the red case has held up really good.
Personally I am searching long and far for a wallet type case. Still have yet to find anything. Just recently I found a company called Zenus that makes premium leather smartphone cases. (I'm new cannot post links yet, just search for them) I contacted them this past week to see if they will be making cases for the z3v. Haven't heard anything yet. Will update when I do!