All are her songs are all-time best

However these are my top picks:

1. Gaaye jaa from Brothers
2. Tum Bin from Sanam Re
3. Deewanu Mastani from Bajirao Mastani
4. Mere Dholna sunn from Bhool Bhulaiya
5. Sunn Raha hai na tu from Aashiqui 2
6. Barso re from Guru
7. Dola re dola from Devdas (one of her 5 debut songs)
8. Jaadu Hain Nasha Hain from Jism
9. Agar tum mil jao from Zeher
10. Bepanaah pyaar hai aaja from Krishna Cottage
11. Bairi Piya from Devdas (debut) *National Award
12. Dheere Jalna *National Award
13. Yeh ishq haaye from Jab we Met *National Award

Also, these regional songs are unmatchable:

1. Jeev Rangla from Jogwa (Marathi) *National Award
2. Munbe Vaa from Sillunu oru kadhaal
3. Pherari mon from Antaheen (Bengali) *National Award