Stating the best always points to a bias, as there are several banks and NBFCs offering a business loan in Lucknow. I would suggest going online and making a search. Instead of going to the individual website of all known banks and NBFCs, you can try visiting aggregator sites such as bankbazaar. Here, every financial institute offering a business loan in Lucknow will be featured along with the criteria for eligibility and documentation. You can get a fair idea of the interest you will be paying. Make a shortlist of the ones that are suitable to you, and you can either visit their websites or call their representative.
As for me, my father wanted me to go with SBI, but I found the loan terms of Bajaj Finserv more flexible, and hence, I availed their business loan. Unsurprisingly, this new age NBFC made the process of applying and availing the loan easy and quick.