Hii Shelja!
Bothe the colleges are good and hold a good name in terms of education and facilitate. These are considered best after IITs. In terms of placement, rv is considered better. Though you can check it yourself by visiting the respective official websites of the college's and get more information too. You can click on the following link for better information -
https://www.careers360.com/question-which-college-is-good-for-mechanical-rv-or-bms-or-pes-or-merit-in-bangalore
Hope this helps.
Good luck!