This is a unique one for me, rating a college just by where it's located. AIT is in a great spot with easy access to both bus and train services. As for REVA, I'm not quite sure. CMRIT also has a good location with convenient bus services.
Pick the one that's closer to you, as both schools are not reliable and don't meet the standards discussed here. Even though they seem like separate engineering colleges, they're actually run by the same group of people.
Many graduates from these institutions end up working as clerks in service companies owned by the same folks who run the colleges.
CMRIT is situated in Whitefield, which is more central. Reva is a bit more on the outskirts compared to CMRIT, while Acharya is even further out. However, getting to Acharya has become easier with better public transport options.