With a proper, colour managed, workflow there would be little difference between different printing techniques as long as the image is within or nearly within the envelope of the media. So, if I print on my Epson 4880 or send of a properly adjusted image to be printed on a Durst Lambda I will get essentially identical results. The printed surface will be different, though.
If you send a digital image for darkroom printing, like Platinum I would guess that it involves a lot of craftmanship and it will be an interpretation of your image by the printing artist.
My understanding is that BW printing is a bit more difficult than colour printing as there is not really a colour managed workflow for monochrome prints.