Most underrated and least mentioned brokerages?

I know a lot of people when they suggest brokerages put out the big three (Fidelity, Schwab, Vanguard) and sometimes might suggest Merrill for their preferred rewards program or Robinhood for the Robinhood gold card, but are there any other brokerages that aren't often mentioned they might even be better than the mentioned ones?

I'm open-minded and am willing to try out hidden gems that might not be mentioned much on Reddit if in the long run it will give me a better experience.