Looking for some information on air compressors. I have it narrowed down to a california air tools small compressor.. There are two options both are a 1HP motor/pump but one has an aluminum storage tank while the other has a steel tank. My question is there a benefit to choosing a smaller aluminum storage tank vs a larger steel tank. It basically comes down to a 4.6 gal for the storage tank volume to go with aluminum. or a 6.3 to go with a steel tank. I know with the compressors at my work, the steel tanks rust inside when the condensation starts building up. Is the rust from a steel tank an issue with airbrushes?