What is better? MyBB, Invision, vBulletin, XenForo

For me the best choice is XenForo if you have a big budget for the software, theme and plugins. If you are limited with budget MyBB is the best choice you can customize your own theme or you can buy one for a very low budget.. also the most of the plugins are free and the paid once are easy to find for free in web like here.. but the most important role in your choice is the porpuse of what the forum will be used for.. if its something illegal you can try with nulled but if its not then have to pay for original files otherwise there is no point to make a big forum with nulled software it will be easy to take you down..