It is always difficult to compare two things, unless one is better than the other in all senses. However MySQL does win two important aspects:

• Speed. PostgreSQL targets a full set of features, when MySQL aims performance. Performance is extreamly important for database applications. It is easier for you to work around the features, the worst just go the long way, do more coding yourself. There is almost no way to get around performance. You can do things to speed up the application, but evetually it is determined by the database.
• Security. MySQL grants much finer access control of database components.

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