1. I heard a lot of things about power regression in Linux Kernel. After releasing 12.04 LTS, most of the issues have been cleared but not all.

   
   
   

   There is an article on Ubuntu which says "Its a mixed one".. For some people, its best release in terms of power management and for some, its the same.

   
   
   

   http://www.phoronix.com/scan.php?page=article&item=ubuntu_pangolin_power&num=1




2. Switching hybrid graphics; Its still not as good as in windows.



3. The new unity desktop.

etc..

Considering all these issues, which should I prefer,

10.04 LTS or 12.04 LTS?

Updated

My hardware:

Lenovo G570;
Intel 2nd Gen i5 ; 4GB DDR3 RAM;
Intel in-build graphics + AMD Radeon HD 6370M - 1GB

I am very much looking for an Ubuntu OS which is really as good as windows. Especially in switching hybrid graphics, installing binaries etc..

Update 2
Powertop results using 12.04 Live CD.