Hello Aman,

Both IIT's are good overall and they both are preferred by the students for electrical branch.Only difference is that IIT Ropar is new IIT whereas ISM Dhanbad(IIT) is a well established college with better facilities and course curriculum.Also somewhere IIT Dhanbad is more prefered by the students for ECE branch as compare to Ropar.Choice is completely on you ,but i would suggest you to choose IIT Dhanbad being the oldest and having great alumini networks world wide.I hope it helped