Nirma University is situated in Ahmedabad, Gujarat while Dayanand Sagar College is situated in Bangalore, Karnataka. Both these colleges are private colleges. Also both these colleges have decent placements as compared to other private college in their respective states. While Nirma University takes admission for B.Tech. courses through GUJCET, while Dayanand Sagar College, Bangalore takes admission through KCET. Both these colleges are good and it is your personal preference and other individual specific factors that will determine that which college might be better for you.

All the best.