Which branch should I choose among IIT Delhi Chemical, IIT Delhi Biotechnology, IIT Bombay Aerospace, IIT Roorkee Electrical, IIT Roorkee Electronics?

The choice of Institute or even the choice of the branch depends on where your inclinations lie. Still, if I would have been in your place, I would have opted for either IIT Roorkee Electrical or Electronics. Here are a few points that justify my inclination towards IIT Roorkee in general and these branches specifically

• The placement scenario of both the branches is excellent with the highest package of both the branches around INR 1,06,00,000. The average packages are well above 15 LPA.
• Both branches provide excellent exposure in terms of opportunities and knowledge 
• The location of the Institute close to the IT hubs like Gurugram, Noida, and the other cities of NCR helps establish industry relations and improve placements tenfold
• The college has a rich coding culture with platforms like SDS Labs, PAG, and IMG making it possible to inculcate coding skills
• The TPO is very responsible and encourages infant companies and startups to offer internship opportunities to its students.
• The overall infrastructure of the campus is decent with hygiene maintenance and basic facilities. Being close to the Himalayas, you can occasionally plan trips also.
• The hostel and food facilities are also good despite the hostels being very old.
• IIT Roorkee has the oldest and strongest alumni network of all the Engineering colleges in India

All in all, the Institute and the branches are much coveted and should be preferred over the other options you have.