because you asked such a dumb question I wont tell you ;-) The question ought to be which broker people dislike the least. Dont ever assume your broker is gonna work for you. Good luck.
In 2008-09 when the Financial World was imploding... It was nice to know that IB would be the last one standing. IB is run by very smart, very ruthless people. They don't care at all about some nano-account that does 10 trades/day... And, equally, they don't care about a Pro Firm's account that does 10,000 trades/day. But they know the Adults are not going anywhere... Because the Adults care ONLY about the Bottom Line.
I love Optionshouse $2.95 per trade and the interface. 100 free trades did not hurt either - here is Optionshouse promotion offer
Optionshouse's low commissions, and the promotional offer for account transfer, look good. I'm not clear if they offer streaming quotes for stocks and options. If you trade options on a stock like Apple, the prices change constantly and you're in the dark without current quotes. I see positive comments from members using Optionshouse -- for anyone who uses them, any comments on the streaming quotes aspect? The cheapest commissions I've found for active traders are at Lightspeed, but I don't see positive comments from members about them.