I wouldn’t say forum cars are better or worse than non-forum cars. Some are undoubtedly better, some are not. It is nice to see a bit of history of a car on the forum rather than buying one you know nothing about. I also think it’s less likely that an established forum member will try to disguise any faults or actually defraud you, for risk of being pilloried on here. On the whole (and there are exceptions), established forum members tend to talk down prices and therefore forum cars seem to be a bit cheaper than the market is asking, on average.