We like TradeStation better in this category. Trades involving large blocks of securities requiring special handling may incur surcharges.
The brokerage firm has no account minimum, and most trades are commission-free. Schwab has slightly more generous policies for its desktop program StreetSmart Edge. Furthermore, the $0 commission policy applies only to the first 10,000 shares in a trade.
TradeStation requires a $2,000 account balance to place trades with zero commissions on its desktop platform, which carries the same name as the brokerage firm.