I know some traders prefer to trade only one instead of the other. What are the main differences between the two? Are they really that different when it comes to intraday movements?
NYSE is a highly prestiageous stock exchange providing a trading floor for the most successful companies than Nasdaq. Examples: LEH BSC C AIG FNM FRE GM F The list goes on and on... And don't forget Krispy Kreme: KKD!
NASDAQ has flakier data feeds. ARCA and BATS are my favorite ECNs now. NYSE seems to have picked up some slickness from ARCA.