Its hard to say. I will say that the nylon if used w out a case will gather more dirt and debris.
I bought the nylon turbo last year because i thought it would have mire grip, i was very wrong.
Ive seen others that ran the nylin w out a case and it gets gunked up if you don't keep it clean. I saw one that was carried in a purse and it looked terrible. The nylon held up, but required more cleaning than just wiping it off with a rag.
Moto Droid Turbo 2