Should i update my phone to android version 4.4.4. to lollipop 5.0 ???

Its very bad idea to update your phone to Lollipop 5 as we don't know which phone you are using and are you using official update or you are talking about some custom ROM. It looks like you just asked question to make thread but nothing more.

I agree with Savera, and I too suggest that always ask question with details as much as possible to get better answers and advice.