I am interested in purchasing an air brush system . It would be used for cakes that I make for family and friends. I don't own a business at this time but would like to in the future. What would be the best air brush kit/system to buy. What is better a nozzle with a gravity fluid cup or a nozzle w/a siphon fluid cup . Or are they both good. I have never use an air brush. Any info would be helpful. Thank you