The biggest reason why the more expensive compressors are better is that they give off less vibration and noise than cheaper models. If you're looking for a clean, work-friendly environment, then this might be something to consider--especially if you'll be using your compressor in an office or other public place! And while it may cost slightly more upfront, these kinds of airbrush compressors will last longer overall with their quieter operating features. Also, note that some evidence suggests that the extra vibrations from louder units can actually shorten the lifespan of components inside them over time (including things like valves). To avoid this problem altogether, many people opt for a brushless DC motor instead, which operates at lower speeds but makes no sound.