Game Database. SQLite, XML, JSON or PlayerPrefs?

Hi guys! Basically the question is in the title: What is the best way to store game data if:

1. It is levels data
2. Items data
3. Initial game settings
4. Player profiles
5. Social data cache

and

1. Data should be updatable via network (new levels, new items)
2. There should be some kind of pro-level editor for this database.
3. There should be way to link (somehow) game resources to DB items. For example new level prefabs and item textures should be easily linked to DB fields.
4. It's mobile project (iOS/Android)

Any ideas or even maybe live examples?

 

I've created a feature request for that. Please, vote it if you like an idea
http://feedback.unity3d.com/unity/all-categories/1/hot/active/3537--native-game-database-engine-and-