The top four IIITs in the country are – IIIT Hyderabad; IIIT Bangalore; IIIT Delhi; and IIIT Allahabad
If you get CS in any of the above-mentioned IIITs, just go for it The next two top IIITs are IIIT Gwalior and IIITDM Jabalpur. But there is a huge gap between these two. You may consider these two as well over NIT Goa. But then it is tricky and it should be left on your preference.
Generally, if you go to any NIT, then the topmost paying salary jobs are usually taken up by the CS guys of that college. So you will get a very good placement opportunity at NIT Goa as well if you get CS. If you are getting any other IIIT other than the top 6, then I would suggest you stick with NIT Goa.