Personal preference would be the main reason; but the wall mount taps also allow the basin and benchtop to be clear, giving a more streamlined look. Also the wall mount don't get that wet, soapy build-up around the base that the basin mounted taps can.

have you tried Recollections in Leichhardt? http://www.earlysettler.com.au/store-locations/

Hi Houzz User, Electroplated tapwear [black] certainly is not harder to maintain versus a chrome finish. It ultimately depends on the type of finish you have selected, and the quality of tapwear. Chrome matt or brushed finish tapwear will be the easiest in terms of maintenance and cleaning, most importantly will not show finger marks. You may have the most complications with a polished finish, in any colour.

I currently have the same problem It quite braves to use White on the floor ( I know you said grey) but we are toying with as it works well with the grey bath we have chosen Have a think about swapping it around to have black on the floor which works great with a contrasting colour bath (white) Also think about contrasting colour for taps (black taps against white or grey tiles)