HELLO

There is no difference in both campus . main campus will be always the BEST option for engineering .

Nice campus ,goood staff,good equipement ,entertainment.

For your question RAMAPURAM will be the best.

Both the colleges are good but comparatively SRM Vadapalani campus is better than SRM Ramapuram. So it is advisable to try for the same if you are getting admission there.

To know all about both the colleges, you can go through below links -

SRM University, Vadapalani Campus

SRM University, Ramapuram Campus

Hope this helps!!!