0jtobako 11 years ago ReplyUpvoteWhat do you want to do? (I've just started and finding out myself...) I chose double action, internal mix for quicker control (one trigger controls amount of paint and air) rather than single action (one trigger controls air on/off, amount of paint/thickness of line has a separate knob on the back) Small items, frequent color changes (detailing models, fingernails) get top mounted gravity feed. You use less paint up cleaning up between colors and the paint isn't cheep (cleaner can be expensive too, if you don't use water-base colors). Large pictures, murals, (t-shirts) try bottom feed siphon. The larger bottle doesn't have to be refilled repeatedly in the middle of something : ) (Why isn't it working now??? Trigger position, bad technique, air pressure...oh, out of paint...) Not sure about side feed : ) Brand name depends on what you can get locally or availability of parts. Each brand has several styles that work better for some effects (according to other people-I've only used the one I have-Badger 175).