Hello Rounak, Greetings!
Both GTBIT and BPIT are almost same in most aspects.
Both colleges have good lab, infrastructure, classrooms etc. Although campus of BPIT is larger than GTBIT.
Placements are more or less the same. You would get placed in any of the two if you are a good student. Distance from college is also a factor.
So, I would suggest you to join any of the two colleges which is at your convenience.
Thank you, hope this helps.