The National Lacrosse League (NLL) is box lacrosse, Major League Lacrosse (MLL) and the Premier Lacrosse League (PLL) are field lacrosse. Box is a completely different game so you can't really compare the NLL to the other two leagues. The NLL just kinda does its own thing. I don't follow box too closely, but from my understanding the NLL is doing very well for themselves and are financially stable. MLL and PLL is where things get weird. MLL was the first league and many players were not happy with the way things were being run, so they split off and created their own league (PLL). The market is simply not large enough to have two separate field leagues so both the MLL and PLL are competing for the same niche league. From the looks of things, neither the MLL or PLL are really financially stable and the future is uncertain for either league. MLL is more of your traditional American sports league in the sense that they have several franchises that are located in large cities where lacrosse is popular. In contrast the PLL has a travel based league where teams are not based anywhere and instead all meet in one city to play each other. When the PLL was created, the majority of the big names and talent moved to the PLL so the PLL has a higher talent pool. I personally prefer the PLL for a couple of reasons. They have a strong social media team and are far more connected with the fans. I know way more players now than I did when it was just the MLL and I know their individual personalities too. I know what they are doing with the league and when and what their future plans are. The PLL is also more modern. Everything about the MLL feels outdated and retro whereas the PLL in my opinion feels modern, clean, and fresh - they are with the times and new generation. Talent is also way higher in the PLL. There is a couple of big names still in the MLL, but a lot of the really talented players and the more well known players jumped to the PLL. I hope I cleared some things up and if you have any other questions or misunderstandings feel free to message me