Quartz looks much more stealth like I think you'll find, and thats how the 40th Edition was originally intended
In all seriousness, Quartz is a lot easier to keep looking clean. I have found that road salty water dries about the same colour as Quartz meaning you can leave it longer between washes and it will looks ok
Haha of course it is
Although I have to agree about keeping it clean. I can wash mine, take it out for a 5 minute spin and it's dirty again, now was not a particularly good time of year to pull the Zed out from it's winter hibernation! For that reason alone Quartz wins.