Hello, hope you are doing well!

SASTRA was ranked 37th among engineering colleges in India by the National Institutional Ranking Framework (NIRF) in 2020, 25th among universities and 48th overall. Its a private college. IIITs are government colleges and are really reputed. IIIT Sri City although didn't come up in the NIRF ranking list 2020 along with the other IIITS that were there on the ranking list.

IIIT being specially started run for IT related streams, it seems to be a better option than SASTRA.  SASTRA is private University so gets better facilities than these colleges but finally exposure ,internship and placements companies prefer the Govt Technical institutes IIT NIT IIIT.

All the IIITs are governed by MHRD. That's why campus development is slower than private colleges like SASTRA. But IIIT Sricity has fared well. IIIT Sri City will run in their own campus completely from Aug 2018. Earlier, they had mess and hostels in their campus but classes were held in IFMR. And trust me the campus is designed and being constructed in a good manner. From a cool academic block to butterfly park, everything is being constructed nicely. The faculty of IIIT Sri City is good and so is the academic level. Research is the religion at IIIT. Almost every student publishes a paper there. Placement is also good, the average for the last batch being 8+ lpa.  You can learn coding well here and land up a good job.

So, I think IIIT will be a better option, be it any IIIT including IIIT SriCity.