중개사가 내 매매 성과에 정말 영향을 줄까? 🤔

It's minimal at best. But it's a hard question because it really depends on how you trade.

I have my main account at Think or Swim and one for emergencies at TastyTrade. One thing I can say from experience TOS gives better fills than TastyTrade, far better. I place identical orders sometimes at both brokers. Tasty very often puts my limit buy order below my prescribed price. I see this when I look at the price ladder where the originating party of an order is shown on the TOS platform. As price vibrates often TT gets it at the lower price so they make the difference. I often get a fill on TOS while the Tasty order is unfilled for the above reason. In my trading at IB and TOS over the years I often got better fills than I expected. Never at Tasty. I am not making this up, I worked on Wall Street back in the day including upstairs and as a floor trader so I happen to know a thing or two about shady practices.