I've tried a xenforo from a demo request. Looks pretty obvious that they blatantly stole sections from the admin cp & rearranged them, many of the same options can almost be found word for word. Sure you may find some options under different menus but many from vbulletin are still there and yet some options have been renamed or moved completely such as their "rebuild caches" tab which is basically bassed off of vbulletins "general update tools".
Long story short there was a lawsuit long ago, it's all out in the open and public record so no need to discuss this in 2019 as it's long passed.