I have used Caravan Club sites for 20 plus years, and C. and C.C. sites for 3 years.
I find that C.C. sites are of a higher standard, but in most cases you will pay more per night.
C.C. hard standings are larger and better prepared than C.and C.C. ones.
C.C. toilet blocks are mostly far superior to C.and C.C. ones and are always heated. Many C.andC.C. blocks are not heated.
All C.C. sites have 16amp electric hook ups. Some C.andC.C. sites only have 10amp hook ups.
Quite a few C.C. sites have television hook up points at the pitch bollard.
I tend to use C.andC.C. sites in areas were there is no C.C. site, but only between end of May and early September.
However if you are 55 or over you are entitled to age discount with the C.andC.C. This can reduce costs quite considerably compared to the C.C. Having said that the C.C. have mid week discounts on some sites.
I have found it is worth being in both clubs, especially since my wife and i have become pensioners.Heated toilet blocks are very important to me due to me having a spinal injury many years ago.
Hope this helps.
Hamer