WiiFlow Lite is a continuation of WiiFlow with theme changes, updates for nintendont compatibility, and some removed features such as fanart, ftp server and dios mios (lite) support. WiiFlow Lite is the most up-to-date and can also be used as a replacement for WiiFlow.
The original WiiFlow is no longer being developed, while WiiFlow Lite is still being worked on to this day. WiiFlow Lite allows you to launch Wii/GC games from an SD/USB drive, install and view 3D box art of your backup games, launch classic retro games and movies via plugin, copy and flash save games etc. This would be one of the best USB loaders for the Wii/vWii you can download, because it’s still up-to-date, fully customisable and has ongoing support.