Hello Vamsi Krishna,
I understand your situation and I'm here to help you and take you forward!
Firstly, both the colleges are well reputed ones and what depends is in which GFTI you are getting. So, it you are good enough in getting admissions into top and good GFTIs, it is better to go for it otherwise choose Sastra University. But getting seat in Sastra is a bit tougher job and there are many GFTIs, so yoy can go for that in any other cases. Be patient and verify the official pages of the Colleges to know more about the admission process and counselling sessions.
Hope you got your answer !
All the best !
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