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Different times and different problems. Unfair to compare.
Nehru donated a lot of his personal wealth to the nation on the other hand Modiji collected Care funds and recently extorted money under the guise of electoral bonds. Modi is destroying the fabric of Indian society.
Data wouldn't back Narendra Modi as a better PM. If you see what Nehru did or started during his tenure and compare it to what Modi is doing, Nehru would beat most/all PMs. Nehru would seem like a visionary but others would mostly seem like just other political leaders in the history of a big nation like us.