Apple clear cases look amazing out of the box and for the first day on your iPhone, if you are in a clean environment. Then they start inevitably accumulating junk between the inner side of the case and the iPhone body. If you are a purist, you would want to take your iPhone out every now and again to clean it, yet Apple cases are also quite hard to remove due to their solid PC structure.
Basically, all the TPU and hybrid (TPU sides and PC backs) cases will have their TPU bits turning yellow in a matter of a few months, while PC ones could be pressing hard dirt particles along the sides of your iPhone when you take them off, risking scratches. So, since hard PC cases are quite slippery anyway and if you want to enjoy the original colour of your iPhone, why not just use AppleCare+ and get a cheap grippy case when you go for somersaults? 😉