dont know about shantiniketan,but dps,birla,dmis allmoreorless the same..older ones like mes,ideal have good reputations too..a few newer schools till fourth grade also oflate.mayb the difficult part is to get admission to your preferred school..though all the schools mentioned are like most schools back in India..not much emphasis on sport/extr curricular activities..only studies..busy preparing kids for the ratrace..would have to say Dps would be better than shantiniketan.
wish you All the Best!!!