My favourite one is Xenforo because even though it is newer than some of its competitors such as IPB, Mybb and Phpbb, it is packed with features and there is an active community who is always willing to help you. I had some issues and I managed to get answers very quickly after posting on the forum. There are also lots of addons from the stock trader to the resource manager. However, one downside is that a lot of the plugins are paid and there aren’t that many good free addons. I think Xenforo definitely has a lot of potential to become the best forum software in the future.