As much as the field has been getting a lot more competitive over the past year, and even with their few faults, I decided that I still have to stay with IB because 80%+ of my trading is in commodities futures options, and I I'm pretty sure, for the moment,they are by far, the best for that.
Those markets, at least the ones I trade most (Gold, Silver, Crude, Soybeans, Sugar, copper etc), are open, and very liquid, 23 hours a day , in some cases.
I'm not crazy, and stay up all night, trading at 3AM.
I actually go to bed by 11 PM, and wake up at 7:30 AM, so I'm not doing anything throughout the night (otherwise you would eventually lose your mind).
But, especially lately, I have been able to put on positions, in the 6 PM (all the markets open at 6PM EST), until around 10PM, and the next morning when I check on them, I seem to have gotten some kind of head start on the next day, by having put on positions that I would no longer be able to put on anymore.
So, for me, the brokerage that can service that aspect of the market the best, is a priority.