I am not sure by 'best role' what do you exactly mean? what is important for B schools and for you as an individual is to have clarity on that why do you want to do an MBA and which sector do you want to really work in post the course, if you have clarity on the same then I think you would be able to capitalise on your MBA degree.
Be it FMCG , or B2B or any other sector , if you a clear goal and plan then anything and everything is good.. wish you the best for your applications