Best OS to run Emulator(/Android Development),Ubuntu or CentOS?

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http://androidforums.com – Which is better in running Android Emulator(/Android Development), Ubuntu or Centos? I've already tried running Emulator using CentOS, I'm not sure about Ubuntu. I'm assuming that the emulator runs faster, or has better performance when you run it in the other OS, or is it the same? If Ubuntu is better, which version? Thanks! :) (General)