Manmohan Singh. He is the man triggered changes of liberalization (impact on poor, still to be discussed)!It has given jobs and hopes to millions of educated youth! India could tape the opportunities arised across the globe especially in services! It is not just Manmohan's magic but as a person who implemented the changes and drive the country through critical time, he is the best.
Mr.Chidambaram is not a transparent personality like Manmohan. He is basically a business man. One thing is sure that, in case of Manmohan, we won't be surprised to know his wealth of 1000s cr when he dies, like Pramod Mahajan (we thought he is a good politician and Minister, by mistake).