Hi ! If you ask me then my answer is IIT Guwahati ECE. There is a reason behind it. In IIT Dhanbad cs is not a special branch. EE us not a hot stream in current market due to low level of job prospect. Same m & c in IIT BHU. Now IIT Patna is not a good IIT at all. Left with ECE which is less competitive in nature with evergreen stream. So hope you understand and best of luck to you.