NPC is my favorite CN-Film. I like the color rendition very much. Unfortunately, it is not availiable as sheet film. It is a little more contrasty than NPS, which makes it sometimes more difficult to print, but the colors, the colors...

I have not yet tested the new Kodak UCs. IMO, the colors of Kodak CN-Film have always been "american style", if you know what I mean.

The papers might affect your results as well. There is almost one grade between AFGA Portrait and Kodak Ultra. But the color rendition of NPC is excellent on all papers. Which is, of course, a matter of taste...