I personally would have listed it in the Tech section..
here.. --> http://www.fordtough.ca/forums/forumdisplay.php?f=16
as for your question..
It will depend on what you plan on using it for.. and if getting into full air tools will benefit you..
I personally own an air compressor with a variety of air tools..
I also own a Mastercraft Maximum 14.4 cordless Impact with 1/4" quick disconnect to put on a sortment of different bits from a square to a 1 1/2" hole cutter.
Now the cordless is lighter but when the battery gets off down a bit I will notice it when I have the hard jobs to do..
Also lumberjack purchased a electric impact.. As well I have used them before..
With them you will get the grunt force for cheaper.. but tend to be heavier because the motors are built in..
also it will depend on the air impact you purchase.. will it have more torque then a cordless.
Air the force comes from the air pressure.. Also a variety of different ones..
but have to have a air compressor to gun..
So what do u plan on using it for?
As well Welcome to the Site!