Does it matter which exchange my order is routed to in most cases? Do you just choose the one with the biggest volume? Using smart routing, my order is routed to the exchange with the best price currently, correct? This only seems like it would matter if I am using a market order (I use limit orders). Also, when I see quotes on the trading tools, are these usually the "best price" that is offered from the choice of different exchanges, or are the quotes usually provided by a certain exchange?