Among the above two institutes, IIIT Pune is the definite choice, considering a number of factors including IT industry exposure, internal competition, and overall development in the institutes. I know a few people from both institutes, so I can give you an idea about them.

Location:(Winning Institution - IIIT Pune)

• Presently, Pune is considered to be a large IT hub, with offices of several companies from different sectors too. In 2018, Pune was listed as the second most paying city for software engineering jobs in India, after Bangalore. 
• For research-minded students, there are several institutes in Pune including the National Chemical Laboratory, and the Indian Institute of Science, Education, and Research (IISER, Pune). This will give you a bundle of opportunities.
• Pune is a metropolitan city in itself, whereas Sri City is 74 km away from the closest metropolitan city, Chennai.

Student Intake:

IIIT Pune takes in a total of 120 students per year, 60 in CSE, and 60 in ECE. On the other hand, IIIT Sri City takes in 270 students per year, 200 students in CSE, and 70 in ECE. Therefore, it is evident that a lesser number of students will get better attention from professors, less internal competition, more opportunities, and a focused learning experience.

Mentor Institute:

IIIT Pune’s mentor institute (College of Engineering, Pune) is located in Pune itself, whereas IIIT Sri City’s mentor institute is IIIT Hyderabad, 608 km away from it. So it is easier for IIIT Pune students to attend mentor institute events, lectures, and facilities.

Extra-curricular:

Students from IIIT Pune have excelled in several sports events too, like IIT BHU’s Spardha. There are several Coding, Robotics, and technical events in which IIIT Pune students excel.

Future Development:

• The growth pace of IIIT Pune is very fast. With a number of hardworking students and dedicated professors, IIIT Pune will soon reach a good height and will be considered a leading institute.
• The 100-acre campus construction of IIIT Pune will get completed, which is being set up in between the city’s core industrial zone. After IIIT Pune receives its own director, the growth rate is bound to increase and so is the development of the institute.

Considering all of the above factors, IIIT Pune is a definitely better choice, providing several opportunities to students in the industry and research fields.