Since you know what you are looking for, it becomes quite easy to segregate categories for you to choose which place you want to go. Do all-around research and look at various categories like crowd, course curriculum as well as the faculty before making a decision. Here are some points that may help you out.

Faculty: One point where IIIT A might lag is the faculty. Being a top college, you might expect it to have some of the top-notch faculty in the country. However, it is more of a mix of government college faculty with some average teachers and others that are really well-versed in their subjects. IIIT D on the other hand has better faculty who have a rational approach to the subject of computer science. IIIT D definitely tops here.

Course Curriculum: You will find some of the best course curricula at IIIT A. You will be introduced to the subjects of computer science right from the very first semester. A major plus point is that there are no interdisciplinary subjects like ED that will be included.

Crowd: As far as crowds are concerned, both places have the same crowd. IIIT A might be slightly better as they do not hold any state-based preferences or quotas.

Coding Culture: The coding culture at IIIT A is one of the best in the country. This college is the pioneer college that represents our country in some of the most major competitive coding platforms. Just recently, 12 students were even selected for GSOC from IIIT A. IIIT D is still in its nascent days as far as coding is concerned.

Infrastructure: This is one point where both colleges are at par with each other. Both are good as far as basic amenities are concerned.

Lastly, you should know that IIIT A is a college with a national reputation. It will definitely give you the upper edge when you go for your masters. This is probably not the case with IIIT D. However, if you are looking for good faculty and a city atmosphere, go to IIIT D.

 If you are given a choice between IIITA and IIITD, take admission in IIIT Delhi hands down. You will never regret it. IIIT Delhi has everything that a good IT institution needs i.e. Great faculty, excellent domestic and international placements, and an overall great experience.

IIIT DELHI

The cut-off for admission at IIITD ranges from 16694-28261. IIITD has a great set of faculty members and the curriculum is excellent.IIITD lacks diversity. With around 85% of the student community belonging to Delhi, it isn't catering to a pan-Indian audience. IIIT-Delhi students seemed frustrated with the workload and students are left with deadlines every single day and thus have no life out of academics. 

IIIT Allahabad

The candidate must have cleared the JEE Mains. The cut off for admission at IIITA ranges from 1291-5330. IIITA has a great coding environment. Faculty is not up to the mark.

They both have a good curriculum but IIIT Delhi has so much more to offer. So If I were you, I would definitely choose IIITD.

Although IIT Goa is newly established and one of the least known IITs in the current time, it’s a decent option to go for among the three. IIT Goa grants you a perfect destination that everyone craves for. The location will give you both a perfect environment to study and relax when bored or stressed. IIT is better than IIIT in terms of its brand value but then if considered from placements and alumni network, IIIT Allahabad and IIT Delhi are definitely better in the current scenario. They are more established and have the advantage of better placements and alumni cell.

However, there is more to college life than only studying. Friends and environment definitely have their effects. Almost every engineering students have Goa on their bucket list. Staying in Goa for 4 years will also be an adventure. So, you should definitely consider IIT Goa for CSE.