qqq underperformance relative to spy & dia to this point could disappear as it plays catchup, or it could be a more serious tell. Unless you are one of those % players as opposed to a pt/trade player, I say it doesn't matter, stay with strength and trade the strength in the large cap NYSE stocks. Why risk your money on at best a 50/50 bet on the NDX. Put up 4 week charts of the big caps and you'll see my point.