The rate of interest is dependent on
a) Amount Of loan
b) Tenure of the loan
It would not be that easy to pinpoint a single bank. Further, these banks change the rates quite often.
On a broader scale, here is what is charged for personal loans-
1. Union Bank- 12 to 14%
2. Bank Of India- 15 to 17%
3. Allahabad Bank - 13 to 14%
4. ICICI - 13 to 18%(depending on Tenure)
5. Bank of Baroda- 14 to 16%
6. Canara Bank - 16 to 18%
This is a broader comparison based on the respective websites. Please note that the websites are not always updated.