ViewState vs Session

Hi

I am aware of the technical differences.But would like to get it
clarified.Given an oppurtunity is ViewState storage more efficient than
Session based.I do not have a scenario where I need to share information
across pages but have lots of information to cache for that page.Can you
please advise which is the efficient way to do it.The page is a search
function which has a minimum of 10000 visitors per day.

Regards
Vishwanathan
.