It has been my experience that the manufacturers RAW processing software produces the best result. I have done a lot of comparisons side by side to come to that conclusion. So for example, Canon files in Canon DPP, Phase One in Capture One and Leaf files in Leaf Capture.
With that said, I am exceedingly impressed with the latest version of Capture One Pro. The Leaf and Phase One files appear to be amazing and the colors, especially skin tones, appear to be more real on the Canon files that DPP.