spike,
Although I trade Nas stocks exclusively I've never found TICK.NQ (which is represented in a variety of ways across different software) to be of much value, and prefer to monitor the standard TICK or what you call TICK.NY. Yet strangely enough, when it comes to TRIN I tend to watch both. Anyway, best bet for you is to set both variations up and refer to them throughout the day. That way you can see if one or the other (or both) helps you with your trading.