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When considering a broker, execution and commissions are probably the most important things, but you also need to consider the broker financial stability and size. IB is very stable, with years of proven reputation and financial stability. What do we know about financial stability of Tastyworks? At this point - nothing.

That is an excellent idea.....to compare IB and Tradier, in real-time to uncover what's what! With regard to fills and liquidity. My instinct tells me that the best , and most reliable, fills will probably always come from IB. There is no free lunch. If you want TOS, for free, you really have to pay 1.50 commission., I have not personally tested Tradier but common sense tells me that unlimited trades are going to have to be paid for from one end or another. With IB I KNOW what I'm getting.......and I have been with them for 20 years.

I am evaluating Tradier now. The $40/mo flat rate for steadyoptions members is good. Paying $1.40 less per straddle (2 * 0.70) than with IB - translates to being able to pay for example 1.87 instead of 1.86 for the recent ORCL straddle and still match Kim's entry. However it seems that I am unable to get those straddles anyway with Tradier, even overpaying 1-2c for them. Will try IB and Tradier side by side to check if I am not making that up. Tradier's own web interface is ok to enter the trades but useless for monitoring. The list of disparate option legs becomes a mess pretty soon. ONE's integration with Tradier is good, the worst thing is that after the trade is placed with Tradier I need to enter the real fill price if I changed it in the process of placing the order. They told me they are working on a tighter integration. But the rest is great. I tried many tools listed on Tradier's site and some more, and found that for my taste ONE is the best among them. The people I contacted in Tradier are very helpful, answering my emails the same day.