Which banks are offering best returns for FD’s ?

I want to invest in FD’s but confused which bank to choose from. Checked some small finance banks as they are currently offering around 7.25 % for period of 1.5 years and above but are they safe to invest compared to famous private banks in India which are offering just 6.6% ? Are ELSS mutual funds a good option for higher returns ? Need your honest opinions and advice.