which DBMS... MySQL or PostgreSQL

I want to start my Open-Source Project.. PHP-Based RPG Webgame in the next 2 months.. Till now, I still confuse in choosing 2 DBMS. MySQL and PostgreSQL. In your opinions, which DB should I use in consider that my Game will content a very big database including Player data, player Stats, Story and Scenario Database , etc. which one that easy to access, fast, and could maintain the sql file in small size.. and easy to backup ???? Thanks for your advise. #Please join Open Community Forum... http://openity.tk #We're free to discuss anything...., you're free to create your own topic in your own language. :D ---DuFronte--- http://kapsul.org No Fuckin' Shits !!