AMD A4-3300 media server radeon or catalyst?

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http://www.linuxquestions.org – I have an HTPC setup currently using the catalyst drivers (Arch + XMBC + awesomewm). What I want to know is if switching to the open source drivers would be better for me? Will I lose video processing power or is everything I need from the graphics pretty much the same between the drivers? The reason I am thinking about it is because catalyst being a right pain with it's xorg-server compatibility and having radeon instead might just make my upgrades that much more smoother. (HowTos)