Metal clay is available in a several different kinds of metals. Each kind has slightly different working properties and firing schedules.
There are several different firing methods for firing or "sintering" the clay, so notice the firing options for each to type of clay. You may make your firing method choice based on the clay, or you may choose your clay based on your firing method. For instance, if you plan to fire metal clay with a hand held butane torch, you could work with copper and fine silver clays. If you fire in a digitally controlled jewelry kiln, you can use any kind of metal clay.
Click on a link for detailed information on usage and firing information plus videos and projects for each clay.