[Emmet_]

I recommend you use SQLite. INI files can clutter your folder overtime and backing up can be a pain in the ass. MySQL would be inconvenient to use for an admin system - what if the server owner doesn't know how to use MySQL, doesn't have access to a MySQL database or is not interested in using MySQL anyway?

SQLite is great because data is more organized, easy to backup and overall convenient for an admin system.