Best is a matter of taste and preference. Asking others is pointless, you'll get a different answer every time.
Just flash a bunch and decide for yourself. And battery life is about setup and usage.... Roms and kernel make a minor difference.
---------- Post added at 07:58 PM ---------- Previous post was at 07:56 PM ----------
Also, best threads are normally not allowed....but XDA was kind enough to give this device ONE thread for such questions.
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