The Lua cheats are written in Lua rather than using debugger expressions which provides for much more potential capability. The XML cheats are converted to Lua for backward compatibility and Pusgy still ships them so his stuff can work with both. If you use his latest set with the plugin and play sf2 you'll see an additional cheat called "Hitbox viewer" that you won't get with the builtin cheat engine. It's an example of a cheat impossible with debugger expressions. Here's what it looks like.