We only use CLs in England & Wales - we notice that an increasing number have toilets/showers and/or fully serviced pitches but neither are "must-haves" for us - pitch size and location are the most important things for us. In Scotland, the scarcity of CLs means that we include commercials in our options, many in cracking locations.Club sites are too expensive IMO, and fine if you want to stay on a featureless gravel car park.
We much prefer CL's but we have no requirement for shower blocks or fully serviced pitches
We've done 102 nights away this year, at an average cost just under £20 per night - slightly skewed by an extra night en-route at a £35 commercial due to technical issues - so would have been just over £19/night otherwise.