I have had both of these.
I first ordered a obsidian black Feather for my black iPhone 5. The case looks nice and fits well. It is very thin and does not add much to the size of the phone. Unfortunately in less than two weeks of office use the black colour started to wear out from the case, showing the white plastic under it. It seems that this is a common issue, according to the number of similar comments in amazon (.com and .co.uk).
After that I bought a clear Snap case from apple store. So far I have not had any problems with it. The case is somewhat thicker than Feather. The iP5 version also has a bigger lip in front than the iP4 version. I think I may go back to Feather, if they get the material issue sorted out in future versions.