It depends of your needs (ondemand for performance and smartass for battery saving).
I get the better relation performance/battery life using InteractiveX
i recommend you to set the performance governor BUT i it will drain batt very fast so go to profiles option ans set there :Screen off ,Max CPU Mhz =320,Min CPU Mhz=120 , Ondemand governor , priority to 90
And with this setting i have very good batt life + good performance