I'd like the same question answered. One huge advantage that I see is that PHPBB is free, But does that mean that it has less available in terms of ease of use etc.?
phpBB is a great for a starter and it is amazing because the source code is awesome but vbull is a bit better because it is a strong software for rapid growth and long term thinking. It is also a lot more secure but if you can not afford it phpBB works amazing you just have to be careful with file permissions.
