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.

If you are not sure which major to choose between computer science and any other program, and are willing to put in the same effort for either of the programs, then computer science can be a great option to consider.

Computer science is a vast field that deals with the study of computers, software, and computational systems. It is a fascinating area that allows you to discover interesting things about how information technology is powering the world. Computer science is a rapidly evolving field, and as a student, you will have the opportunity to learn about the latest advancements and trends in the industry.

However, before making a decision, it is important to figure out if you have a genuine interest in either of the programs. You can read a few blogs and articles about computer science and any other program you are considering to find out which one sounds more interesting to you. It can also be helpful to talk to a few IIT pass-outs from both of these majors and observe their career growth.

If you still find it difficult to choose, taking a blind leap of faith and studying computer science can be a great decision. Computer science is a versatile field, and a degree in this area can open doors to various job opportunities in the IT industry. The demand for computer science professionals is high, and it is a field that promises a good salary, job security, and career growth.

Overall, the choice between computer science and any other program ultimately depends on your interests, career aspirations, and personal goals. If you have a genuine interest in computer science and are willing to put in the effort, then it can be a great choice to pursue.