what is more popular silver or black face plates

I agree with @max_sansui 

Black, out of sight, out of mind.  I just want to hear the music!  Cheers

I prefer black, but on occasion have bought used gear that is silver. At the moment, it's all black for me.

Has to be black... Black is pure class, doesn't stick out at night when I do most of my listening... Silver is a eyesore, and it looks cheap and unfinished IMO 

A great many worthy components are available ONLY in black, or with token flashes of chrome. Black buttons on a black background in a dark room is not my idea of functionality -- or beauty. For me it's industrial chrome (silver) or nothing -- almost. Yesterday I changed out a silver tuner for a black one (new in box 3 years after purchase) for reasons of sonic necessity. Like McIntosh, NAD available in black only.

Either or I've learned that it's what's behind the face that counts.