I have an offer for MSc in buisness consulting from Warwick business school and for MBA from University of Bath. I would like to land a job in the UK, hopefully in consulting. I have an experience of 9 years in IT in India.

Which of these schools would be a better choice and why?

Did you compare the MBA and MSc rankings, and see the average percentage employed at the end of these degrees? That could be your answer.

Also look at the scores for "International Mobility" in each of these rankings - this is a good indicator of how likely it is for international students to make the leap to the UK. The higher a school is ranked for International Mobility, the assumption is that it would be better for the kind of transition you are looking for. 

My gut feeling is that the Warwick program would probably be better at helping students make the transition, but because it is a pre-experience degree, places into less senior roles (with smaller average salaries.)

If you are strongly considering the Warwick program, you should figure out how the average salary that grads make after this program compares to what you are making now, and see if it's worth it.