If you are specifically referring to clubs at LAX - my opinion - they are about equivalent. The LAX CO PC is a little larger, but the views are better at the LAX NW WC since it is on the second floor (different terminal) and I prefer the self-serve bar and beverages in the NW WC. The coffee/tea is self-serve at the CO PC but the bar/soft beverages have a bartender.

Both the CO and NW LAX lounges have restrooms, but neither have showers.

The attendents at both are very nice and helpful. I also find the counter and gate agents for both CO and NW at LAX to be exceptional nice as well - much better than some other airports I could mention.