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TD Ameritrade's service is on par with NinjaTrader's and a comparison of their fees shows that TD Ameritrade's fees are similar to NinjaTrader's.
Account opening takes somewhat less effort at TD Ameritrade compared to NinjaTrader, deposit and withdrawal processes are about the same quality at TD Ameritrade, while customer service quality is similar to NinjaTrader's.
Our experts rated the trading platform of TD Ameritrade as somewhat worse than the platform of NinjaTrader, found that clients have access to more markets and products with TD Ameritrade, while NinjaTrader provides just about the same quality of research and education.