"Does anyone have experience with both system that could offer an opinion?"

Having done 100hrs XC with the CNII and LX9000, I would have to say LX, by a fairly large margin.

I would score the LX higher relative to the CNII in terms of user interface, stability and flexibility. The CN mostly works but isn't much of an advance over WinPilot from 15 years ago. Many of the basic functions require large amounts of button pressing and concentration, which is not good for lookout and soaring. The LX, however, can be mostly set-up and left that way while you get on with the flying. In those 100hrs I have had quite a few freezes and crashes from the CNII but the LX has been 100% reliable - I guess this is down to the maturity of the software and the underlying OS.