I operate a Kodak Professional RP30 (which is really a modified D-lab), both printers can give you excellent results. however just as important as the printer is the software that is being used to send files to the printer, I use kodak Pro dp2 software which is great for pro labs using kodak equipment.
Also another huge factor, that is not mentioned enough, is the level of knowledge of the staff and level of maintance that is done on the printer, to keep the printer working at top level