Clock Your best setup?

In your experience, what combination of ROM, Kernel, kernel settings, and Bootloader yielded the best battery life and speed?
For me, it was probably the last build of stock JB, with root. I was capable of getting up to 10 hrs of screen on time, and loose 1% over night. With KK, i get 3-6 hrs max.
Devices
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Tablet
Phone

[LEFT]Nexus 7 2013 32Gb/LEFT]
Samsung Galaxy SII T989D
Stock JSS15R
Almost anything with touchwiz