I think it would be better.

Well.. doesn't vbulletin cost money? I mean, you get more options and coding and such, but I think it depends if the admin has some extra cash to invest in.. I always like phpbb. It's pretty comfortable.

I'm in the middle of switching over to php but I've been really ill the last few days so been put back a little... It's coming :-)

If vBulletin is more user-friendly and had better features, I'm okay with the switch as long as I can still contribute to the forum.