Suction feed airbrushes use bottles or cups that connect directly underneath the airbrush body.
These suction feed models are particularly suited for medium to larger area coverage as they have larger nozzle sizes and fluid capacity.
Siphon feed airbrushes have the ability to colour change quickly as other colours can be pre-mixed and stored in additional bottles. Simply spray through airbrush cleaner and then plug in your new colour and your good to go.
This range of airbrushes have rubber internal o-rings and are only suitable for use with water based paints.