water based are safer for your health than solvent/enamel based products. Tip dry is just a part of water based paints, just clean the tip every 30 seconds or when you hear the air change and you'll never have to worry about tip dry. You can also have scrap paper alongside you and give a quick spray to remove the paint on the tip (but that wastes paint) you will suffer tip dry while you learn the airbrush and learn proper technique. As you get more time with the airbrush the tip dry will not occur as often but will still happen. Different colours dry on the tip quicker than others - white is a common 'tip dry' problem. If you are painting in your house then consider the water based option. You may be masked up but do you have other humans / pets that can also be breathing in any non water based products you are spraying ? Airbrushing IS fun, but like everything else, you need to learn how to use it properly.