Many, many makers start out doing nothing but stock removal and may or may not eventually start forging later on. Then there are quite a number of folks that start out making knives using nothing more than the forging method.
Stock removal is nothing more than that. You start out with a piece of flat stock and "remove" material from it by means of a file, grinder, or sandpaper. Many stock removal type makers have their heat treating done by other folks, some do it themselves.
Forging on the other hand is where the piece of steel is forged or hammered to shape, to usually about 90 percent complete and is ususally finished to its final shape by the same methods mentioned above. Most, if not all forging makers or smiths do their own heat treating.
Which method is better? (Pssssst! It depends on the heat treat!!!)
Actually, it kind of depends on what your personal preference is. At this time, I do nothing but stock removal but I keep threatening to start forging. That is, if my neighbors don't mind. You see, you can do stock removal just about any where. Forging? Well, how close do you live to your neighbors? Some folks just don't appreciate the sound of a hammer ringing on an anvil at 8 am on a Saturday morning.