All three of these institutes have their own advantages. Here is a brief comparison of the three.

• BMS College of Engineering (BMSCE) is well-connected so is Manipal School of Architecture and Planning. The architecture department of RV College of Engineering is located in a secluded area.
• In terms of crowd, the preference order is RVCE>BMS=MSAP.
• The hostel facilities offered at all these institutes are decent.

If you want decent academics and lots of real-life exposure then the best option among these three is Manipal School of Architecture and Planning.