See as you have provided different courses and different colleges. So we will take it one by one. First the college. IIT Roorkee and IIT BHU and IIT Guwahati. So see regarding IIT Roorkee and Guwahati both are one of the oldest IIT. BHU got IIT tag recently. So regarding placement , IIT Roorkee slightly Dominate over IIT Guwahati but sometimes Guwahati dominate . BHU is less than both.

But regarding research BHU is one of the best .

Now talking about ECE and ee . So it completely depends on your choice. Your preference . If you like doing coding with electric then ECE is best and also it is slightly inclined towards IT industry's. If you like pure electrical then ee is best.

I would suggest go for ECE in IIT Roorkee or if not then in IIT Guwahati. You will get a better environment .

Thank you.