According, to Careers 360 AOT has AAA ratings which means Above Average and Heritage has AAA+ rating which means Good.

If we compare the colleges then you should opt for Heritage college as it has good ratings overall. It provides good placements and faculty. 

If we compare the branches than mechanical branch has more scope in the future but you should choose a branch according to your interest. Both the branches have good scope in the future in terms of placement.

You can also check the complete ratings and reviews of the college from the given below link

AOT Ratings and Reviews

Heritage Ratings and Reviews

Good Luck!!