Things to hate about PHPBB: they get hacked, constantly... Their captcha doesn't work for crap (as it still lets bots register and spam)...
I'm not saying this as a UBB fanatic, or beta tester, I'm saying it as someone who actually had a PHPBB2 forum up for several years and finally got tired of the spam, patches, etc and ended up CLOSING the community...
There are plenty of threads in this forum which cover your topic however, we've all given our opinions on why we like the UBB, and instead of posting it again, I'd like to encourage you to just read through the Pre Sales forum as you'll be able to hear from several members who aren't active here "all of the time".
