Hello,
Congratulations on getting such good college and branch options. I will give you a preference which will comprise of all these factors:
As far as the preference order is considered ECE and mechanical are two entirely different branches, if only institute is your preference then IIT Kharagpur over ISM.
I would also like to add here that an engineering course should be very much taken with an interest in the field so I would suggest you to consider that factor and if you are not aware of the branches mentioned look them up on the internet more reliable will be to go through the syllabus on the respective colleges' website. An interest in the field is the key factor in deciding how your 4 years of college will be and what opportunities you will land for yourself.
Good luck, hope it helps!! (javascript%3A;)
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