@soulz2003 I also explored migrating from our current forum (vB5) to Xenforo. While I did really like XF, I moved it to the 'no' pile simply because I don't consider it modern software that would keep users engaged for say the next 5 years. XF is pretty much like all other old-school offerings out there.
The only 'next generation' forum engines I'm aware of are NodeBB, Discourse, and Flarum, but there might be others.
Funny story: I setup a small Slack channel to discuss future forum ideas with a few members. After using Slack for only 2 days NO ONE wanted to go back to a 'traditional' forum (NodeBB included). If Slack was free and included a 'Posts' feature I would not be here at all. I emailed the team at Slack about adding these features and also offering a self-hosted version and was told they were already evaluating some of those options.