[ilovecookies]

While one could say that this is about savefiles for games, I would say it's implications could more be about savefiles for software projects. If you are building the game in LUA, of course LUA is going to be the preferred way to save your game in since you are already using LUA objects and interpreting files in that language will be easy to integrate.

If you ever used maven xml configs, java object marshalling or c# xml you would understand the pains of using xml as a file format for software projects and data representation. You have to find a solution that is language agnostic, neither LUA or JSON is.