Actually, in my experience, I have not found them to be tighter or more generous with money. I've found them to be about the same with handling money as non-Jws, though less likely to invest their money, but unlikely to waste it on cigarettes, pubs/clubs and gambling like many non-jws do. I certainly don't find them tighter or stingier than normal people though, and slightly more honest.
What are your experiences with JWs and money compared to non-JWs and money?