It comes down to how much muscle you need.
Big air tools will
typically have more oomph than corded tools, which
usually have more guts than cordless ones. Check the specs on a given tool that interests you.
Max torque: 145 ft-lbs
Max torque: 300 ft-lbs
Max torque: 345 ft-lbs
Max torque: 434 ft-lbs
Max torque: 600 ft-lbs
PC.