TD Ameritrade vs Fidelity — how do they compare?

TD Ameritrade was acquired by Schwab and its customers now use Charles Schwab. The thinkorswim trading platform (originally TD Ameritrade's) is now Schwab's flagship advanced platform. Fidelity remains the top alternative, especially for long-term investors and those who want fractional shares on individual stocks. For active traders, thinkorswim on Schwab is best-in-class.