hi Julie. as an ex motorhomer, we found the caravan club better, it is difficult to make recommendations as everyone's requirements are different, however using a motorhome is slightly different from either a caravan or a tent, and requires a different approach. both clubs are good and both have small 5 vans sites, but on booking in the caravan club allocate you a pitch, the camping club doesn't, some prefer this as you get to choose, but there is nothing stopping someone pinching your carefully chosen level pitch when you go out for the day, [happens a lot on busy sites] also a lot of sites dont have level pitches but the caravan club seems to have more hard standings ideal for the camper van.
also look for small private sites these can can be very good at catering for the motorhome, and ask about utilities when booking sites, it can be difficult sometimes to charge the water and empty the waste when the waste and water points are hidden behind the toilet block or behind someone's pitch.
as for unruly kids, afraid you will find them anywhere, it is pot luck even on small sites. it is no good while you have a 13yo but in 3 years when they are 16 and technically an adult you can then use adult only sites. no kids on there just the odd unruly dog, and unruly OAP to bother about.
good luck and happy camping.
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