which is better among SRM main campus and bangalore institute of technology for cse branch?

Hii,It all depends on what ur priorities are.I am providing u with an overall comparison on major aspects.

Infrastructure - Srm Chennai will be a better option for sure as a 7storey building is all what you will get in Bit.

Location - Bit is situated in the heart of the city (near kr market)and its accessible easily from any corner of Bangalore(metro connectivity being an added advantage now). p.s I don't have much knowledge about Srm as in where it is located.

Placements- Bit is very good in placement aspects and as u r asking with respect to computer science branch,u don't need to worry much about placements .All u have to do is to maintain 70% aggregate to be eligible to sit in all the companies.Companies like Amazon,cisco,akamai,jpmorgan,musigma,Nokia,Samsung,Oracle visit bit Though mostly for testing roles,they offer u a handsome package.

Personality development - Though there are quite a lot of clubs like rotaract in bit,I personally feel that u don't get that much exposure in bit.There are no playgrounds in the campus for any sports activities .So Srm would be better in this aspect.

However,I would recommend bit personally as it is quite good overall.The pleasant weather of Bangalore also serves as an added advantage.

Hope,this information helpful for you.Goodluck for your future.