Which is best for bsc math honour ramanujan or pgdav ?

Ramanujan is better for bsc maths since it has better faculty and the teachers are supportive in academics. If placement is taken into consideration then i think all du south campus and off campus colleges are nearly the same in placements. Nobody comes to you, you have to go by your own, be alert and aware of whats going around in the college. So if academics is your priority go for ramanujan.

I think Ramanujan is best for maths hons. Because the faculty teachers are best . They are very supportive and very punctual in their work and taught each and every student with different methods or way if anyone has problem in the concept  and extra curricular projects are given by the teachers which help the students in their resume for better jobs.
Going by the facts, it has been rated A by NAAC. Also in the NIFR ranking given by Union Human Resource Development (HRD), Ministry's national ranking framework ranked it 26th followed by same eminent colleges like Jesus and Mary(50th), IP college for women(52nd) and so on.

All the best