Since my sister studied at RVCE, I can give you information about it.
Placement:
Academics:
Exam Pattern: You will definitely score more than or equal to 90% if you solve 3-4 previous years semester endpapers.
Not commenting anything on lower IIITs since I don’t have much knowledge about it. But, if given a chance to join any RVCE or any lower IIIT like Kota or Vadodara, I would always go for RVCE.