There is no reason to use Mod Organizer 1 over Mod Organizer 2. Mod Organizer 1: Although Mod Organizer 2 is 64bit and was designed for 64 bit games, it works perfectly with Fallout 3/New Vegas. Nexus Mod Manager/Fallout Mod Manager: Outdated/abandoned, have no virtual file system or even dynamic movement of mods with loose files. Vortex: Lacks many essential features, such as manual load order control or a virtual file system.
