IIT Madras has recently upgraded its position in the top engineering colleges of India and is currently way better than IIT Hyderabad in terms of infrastructure, faculty, quality of learning and placements. But, since you want to compare two different courses, you might have to look into your personal reasons for doing the course. Mechanical Engineering is the branch that uses the physics of motion and kinetics to develop machines and maintain mechanical systems. While electrical engineering applies the physics of electrostatics, electrodynamics, and magnetism to generate and transmit energy. So, you have to decide which course appeals more to you. Because, in the end, your course will definitely matter more than your college. However, if you feel you can do both these subjects, then I suggest going for IIT Madras for the sake of its reputation.