what is more popular silver or black face plates

I have both. I don't really have a preference. I think some components look better in black and some silver.  My dac, ddc, clock, and phono stage are silver. Everything else is black. 

I purchase a fair number of used components, so I have given up being that picky.

That being said, I find myself grouping them by colour on the rack.

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! 

I know it doesn't apply to all but silver has mid-fi vibes.

Silver, black faced gear is hard to see in a darkened room.

Leo Fender was a trend setter.  

I personally prefer black. I’ve noticed some companies (Parasound comes to mind) charge more for the same component in black. 

Black

The Rolling Stones had it right from the start!

I see silver face plates

and want to paint them black

no champagne or gold for me

it’s got to be flat black

i see my line of gear 

and they’re all painted black

I returned the natural amp

and exchanged it for black 

changed my return address 

so it never can come back

well you get the idea