Bachelor of Technology [B.Tech] (Industrial & Production Engineering) From IIT Delhi, New Delhi

I will restrict my answer to Engineering Physics and Chemicals only as I know the same only. 

• The major criterion followed at IIT Delhi by all the branches is a well-maintained CG. To secure good placements one has to constantly score a good CG throughout the program.
• During your admission, the department does not play any role but your 85 percent constraint on minimum possible strength does.
• Engineering Physics is a unique branch for those highly passionate about Physics and want to pursue higher studies in the same
• To secure core jobs, one has to move to MTech in Engineering Physics from BTech in Engineering Physics.
• For Chemical Engineering students, BTech is more than enough to secure decent packages and great research opportunities outside India.
• Consultancy and Analytics jobs are offered equally to students of all the departments 
• Engineering Physics graduates usually take up consultancy or IT jobs 
• Chemical Engineering is the most laid-back department of IIT Delhi with very flexible academics thus making it easy to maintain a decent CG throughout. 

I wouldn’t suggest anyone go for Engineering Physics if they have no intention of pursuing it later. Instead, look for other options in BTech and explore your interests.

Both IIT Delhi and IIT Ropar are highly reputable institutes in India, and both have strong programs in production industrial engineering and computer science engineering, respectively. However, if I were in your place, I would have chosen IIT Delhi Production and Industrial Engineering. Here are some strong points supporting my stance

• Location : Located in the capital city, IIT Delhi offers great access to coaching institutes for preparation for IAS, IES, GATE, or any other competitive exams. This won’t be possible at IIT Ropar.
• Reputation: IIT Delhi's Overall ranking by NIRF is 3 out of 200 colleges in India in 2023 while that of IIT Ropar is  33 out of 200 colleges in India in 2023.
• Reputation: IIT Delhi is not just an institute it’s a brand that every recruiter and student is aware of.
• Curriculum: IIT Delhi Production and Industrial Engineering has courses similar to Mechanical students so the job opportunities are also similar. Additionally, you can learn some management skills through subjects like industrial engineering subjects Quality control, Operations research, Production planning, and control, etc 
• Placements: IIT Delhi has a track record of excellent placements way better than IIT Ropar. It can further be understood through the table below

Considering everything, IIT Delhi is a better option than IIT Ropar. The opportunities, brand name, and academic environment you will have access to will be unmatched. However, if you have a specific inclination towards the CS branch and want to pursue a career in the same, you can also consider joining IIT Ropar as the CS branch has diverse job opportunities even for the average students.