Between the two setups there is one reason why I would put the filter before the quick release. That is off coarse if it has a mac valve.
If the trap is after and you are working at low pressure, there is not enough air to force the water out of the trap when you press the release button. But then again, there might not be enough air to push the water into the trap in the first place.
Also if you turn down the air pressure, the air will build up in the trap and your first press of the trigger, the pressure will be higher but will settle straight away.
It is more comfortable to hold this way.
Storing the airbrush with the trap needs a bit more space and you will need a trap for each airbrush.
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