I prefer the look of black with grey suits personally, but will occasionally wear brown for a bit of variety.
With dark blue suits, I prefer the look of brown, but will wear black for a bit of variety.
This, however, is based on the fact I'm not in the city. I work at a firm of consultants in a small town who mostly wear jeans and I just wear suits for pleasure, not because the rules say I must.
I voted Yes - but not CBD. If you want to look smart, black will...