I personally use Schwab, because (at the time I opened the account) opening an investing account also let you open a checking account with refunded ATM withdraw

I personally use Schwab, because (at the time I opened the account) opening an investing account also let you open a checking account with refunded ATM withdrawals. The brokerage account also has access to extended hours trading, though I don't know if that's a standard feature. I also have a Capital One Investing account (partially because I rolled a 401k into an IRA there), and I can say that Capital One has cheaper transaction fees. But I'm an index fund investor, so I don't really care about the fees as much. That's the extent of my experience with investing. It's not a lot, but I hope it helps.