Articleship in big 4 - should i take tax or audit?

I have passed my IPCC held on May 2011. This was my 1st attempt and i secured 69% in the same. I want to enter in to the corporate after completing my CA. I have been offered tax in one of the Big4s.. Many of my seniors told me that taking audit would give me a better scope..

I am confused as to whether go ahead with this offer in Big4 or to seek article in a midsize fim.. please help