Good morning. I'm having trouble deciding which broker to use. I will be trading often and in larger share sizes. I'm a MAC user but wouldn't be opposed to using parallels on the MAC to run windows if need be. However, I want to make sure I get the fastest execution possible and speed is very important to me. Can you guys let me know what brokers you prefer and some of the advantages and disadvantages of the brokers you've used in the past? Am I over thinking the importance of the broker? I've traded with Etrade for years and want to try another broker. I've downloaded TWS and Think Or Swim platforms. Basically, I'm obsessing on making sure I have the best platform and want to get other opinions.