It's a very silly question as everyone's opinions will differ?
I think all uk sites suck as there is always so much more they could do but never will.
Have a lovely day now
Best site that I've been to is Snetterton's sup'air field, just for the quality of the field and staging areas, full netting(roof too), wind-blocking embankment, access to ameneties (food etc.), friendly and helpful (and very accomodating) staff. I don't see how you can beat it. It's just a biatch that it's 4 hrs away from me