I used to envy how Brent Green did such a wonderful job with his Aztek. Then I found out that the Aztek is not a good airbrush for me after getting one.
It is for the average Joe, a weekend modeler, like me that a "better" airbrush makes the difference. I found it easier for me to learn and build up skill with my Iwata HP-CS and the H&S Evolution than others that I also have. It is to a degree personal, but I stick with the comments I made.
- I don't like airbrush whose trigger change from no flow to dumping paint too quickly.
- I don't like the trigger feeling loose or sticky. ( 2 extremes)
- I like springy needle with a good polished finish. (more damage resistent)
- I like laying down paint in multi-pass, misty layers. (Small linear airflow angle)
They are in addition to a well balanced and easy to clean airbrush. These preferences are subjective but the observation are very objective.