X.Org X Server driver or AMD proprietary driver?

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http://askubuntu.com – I see that my machine (Radeon HD 6290) has the option to choose either the X.Org X Server driver or the AMD proprietary driver: I want to know which one is the recommended one in term of performance in general? Do one of them have an edge over the other? And apart from performance, is there any stability issue with them in general? How often are they updated? (HowTos)