National Trust houses are beginning to look like M&S, all NT branding everywhere, same stuff in all the shops. All staff trained to say so much and no more and the story of each house being redced to one story only. They work hard to dumb down the houses. NT properties now ahve to conform to the corporate image.
I am a maverick, i am interested in things that have nothing to do with the politically correct story the NT want to tell - I am curious about samplers, needlework and furniture. Once upon a time NT room stewards knew about these things, they don't now.
HHA houses are still run by the families who own them, they are idiosyncratic, superb, good, occasionally awful, but those showing you round are enthusiasts and immensely knowledgable. Their shops are immensely varied and, as Cabbie21 says, it is often the owner or a member of the family who show you round.
We belong to both the NT and HHA and whenever we travel anywhere both books go with us, but we always prefer to go to the HHA properties over the NT.