XPERIA M Official ROM vs XPERIA M Unofficial ROM

Hi guys, i want to asking question in my mind.

what is the best ROM on XPERIA M ? Official ROM from SONY or Unofficial ROM from Cyanogen,Omni, and anymore?
I want to know best performance ROM before i flash my Xperia :D

Pliss comment my thread and im sorry for bad english :(

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