There are 3 governing situation in your question.

1) source of income - I f your financial base is strong you can go for nlu otherwise au will suffice.

2)Targeted area - If you want to go for upsc au will do its job but if you want to join corporate sector then nlu outshines au because au has no placement cell.

3)You - tier 1 university might be able to provide you a headstart but in the long run it all comes down to you.

hey pratyush,
in my opinion u should go for nlu, bcoz there competition level is good compared to other universities.
but all depend on your decision.
thnks!