what is more popular silver or black face plates

I prefer black, but if I'm getting a great deal on silver faced piece, I don't care...

I prefer black.  When shopping for used gear, I've unfortunately seen silver to be consistently a bit cheaper used.  So I assume there is more demand for black. Jerry

On tube, gear clearly black as it provides more contrast to the tube glow. For the rest, typically there is no choice. I may prefer silver slightly as dust is less visible on it. 

I find black keeps me in compliance with Death Star regulations.

I'm a silver faced guy myself, I mostly see other systems using silver,  I'm surprised by the all black comments just posted!