What is better : studing in an IIT in India or Sudying abroad in USA or UK's foreign universities for my master's (in mech. engg) degree?

I am currently pursuing B.TECH. Mechanical Engg. in India. I wanna pursue higher education after B.TECH MOST PROBABLY M.TECH IN INDIA or M.SC in UK.I wanna know what would be a better option for me: either studying in an IIT in India or studying abroad in UK or USA or CANADA for my higher education?