Jesus...I don't even trade BOX and I hate them. Every frickin day I get a IB notification "BOX is unavailable due to tech problems at the exchange" How crap do you have to be to have problems every day for 2 weeks? How can I unsubscribe from BOX? Is there a worse US exchange?
Amex for sure. They are crooks with a habit of busting option trades. Nothing grates worse than selling off a position right before it tanks, patting yourself on the back for being smart , then getting a notice later in the day AMEX busted the trade cause the MM claimed the exchange gave him an incorrect feed.