Big 4 - Tax or Audit - Please Help

Hi Friends, I am a recently passed CA currently in Bangalore. I am getting a lot of calls from Big 4s to join in them with Tax OR  Audit.

     1) Hi friends could you please let me know the nature of the job if I join in 'TAX' section

2) Which one (Tax or Audit)  requires less or no travel (outside Bangalore) as I dont want to travel outside Bangalore.

3) Will there be leave on Saturday in Big Fours (or even need to work on Sundays) ?

4) Whats there approach in giving leaves (eg: for  going to native place)

Please share your knowledge/experience