I would like to chime in on this. For the simple fact moreover because regardless of slate or space gray or silver or whatever, it STRICTLY has to do with how the person handles their phone on a regular basis.
My point proven: My sister had a i5 silver and it had huge heavy dents on the edges even though she never dropped it but she always throws it in her huge purse. this is not the bad example though lol read below
I bought a 2 week old 64gb att iphone 5s in space gray from a local dude on CL. When I met up to my surprise OMG this phone had dents on the back scratches ALL over the sides, it was a big mess and I could not fathom that someone would treat a $850 piece of electronics like this. So I did what any one of us would do, I bought it

This was the first time ever I carried the phone completely naked for a one week period considering it was already dented and scratched what do I have to lose lol
Its amazing how different and nice and premium the phone feels naked. I have had every iphone since the 2g and wow I love carrying it naked.
Needless to say I just got it switched out today and put ghost armor screen protector and now am debating either carrying it naked or putting a clear case on. I am just nervous about what if I drop it on concrete, what do you all think?