The AW57 is 12" wide head with 1.75" diameter tube. It is made by PMF. It now comes with the easy to operate trigger for less stress on finegrs and wrists.
The AW 24 has an 11" wide head and a 2" tube. It is made by
Prochem. Some folks like the Prochem brand name. Others may buy it for the wider tube and increased airflow.
Both wands are stainless steel, "S' bend style and have 4 jets.
If you are anywhere near a distributor, try them both out and see which feels right for you.
Scott Warrington