http://www.tooltopia.com/ingersoll-rand-109xpa.aspx This is the IR ratchet, it has a higher free speed and more max torque than the Snap-on ratchet.
http://store.snapon.com/Air-Ratchets-Ratchet-Air-Super-Duty-3-8-Drive-5-65-ft-lb–P643049.aspx From what i have been told this is the best 3/8″ ratchet Snap-on makes.