PIR normally open

I am thinking of using a PIR which is normally open. When the PIR closes will the output send high or low? I am guessing that it is based on if I use a pull-up or pull-down resistor? I am just unsure if the pir will bridge VCC or ground at this point as I do not have access to it yet.

In my sketch would it be better to use CHANGE or LOW/HIGH?

You will only know for sure when you get your device.

Many outputs are open collector and so will need a pull up resistor.