just as it has been said, you only really know how good insurance is when you make a claim, some of the cheaper ones can be incredibly good and some expensive ones, incredibly poor, it pays to read the schedule very carefully.
as general rule if I am forced to have insurance I usually opt for the cheapest, but if I want to insure something voluntary usually opt for the best cover.
this may sound odd but, it is to do with regulation if you have to be insured like say on a car or motorbike, there will be safe guards built in, like minimum cover, the difference is in the extras like excess and ncb cover or damage caused by your own fault, if you make a claim and some one else is to blame then it is their insurance that pays. so why pay over the odds.
however on the other hand if it is not compulsory say pet cover or personal items, there is no regulation in place so you are only protecting your own investment and therefore it is worth seeking the best cover for the cost involved.
caravans come into the second category so it is worth getting the best one you can find.
and yes I used the CC insurance, and recovery, as they seemed the best.