I have a phase one p45+. This back is CCD but very old, it has a Kodak sensor and it's not that great in terms of DR, BUT compared to CMOS, I enjoy the shadows even if they are noisy. With modern CMOS there is a lot to recover from shadows, but it looks horrible, wrong, desaturated colors, with the p45+ it goes noisy but the color still look right. I guess if you pixel peep or do some measurments the DR will be better on the CMOS, but watched from a distance, the image as a whole looks better on the CCD to me. Not to speak about colors, but I believe this is because of the bayer filter strength.
I think the reason to go for cmos was because it's cheaper and consumes less energy.