[Lorenc_]

Personally, I'd choose SQLite, it automatically creates your tables for you and is fairly easy to use, Mysql is great as well though you'd need to set up tables and other things, can cause stress if you have a fairly large amount of columns/rows (Like a roleplay script) Though UCP and ACP can be made via that too

Really depends on what gm you want to use and what you want to achieve from it

EDIT: Late calg00ne won :P Had myself waiting another 1 minute before he posted :/
EDIT2: May of gotten confused with SQL and sqlite, sorry about that.