Buying guide
Choose tools by project, not by quantity. For a card holder you need precise cuts, an even stitch line and clean edges. For belts you will also need hole punches and, if you repeat sizes, belt end punches. For bags, a stitching clamp, skiving tools and a consistent marking system all save time.
Cut quality depends as much on the edge as on the tool. A professional knife that is not maintained cuts worse than a simple tool kept sharp. Use a cutting mat for blades and a punching board for hole punches and end punches. Before you buy a size, check the leather thickness, the hole diameter, the stitch spacing and the size of the thread or hardware it has to work with.