Default Battery life and analyzer (no root): 4.2 vs 4.4

Hi,

I am on 4.4 and have horrible battery time. It last less than 12 hours with about 2.x screen-on time. I've turned off wake-lock on almost all battery time. Yet CPU spy says deep sleep is only 13% of time.

Most of the tool requires root on 4.4. Yet I can't root my device.

I am wondering if I should go back to 4.2.

1. What's the battery life comparison b/w 4.2 and 4.4?

2. Under 4.2, without root, are there tools allow me to find out what is eating my battery?

Thanks
gTablet, DRH Jelly Bean 4.3
Kindle Fire HD 8.9, PAC-man
Moto X XT1058, AT&T 4.4
Samsung Galaxy S4 i337, AT&T, 4.3 rooted