Chippers and chipper shredders are both tools that can be used to reduce the size of yard waste, such as branches and leaves. The main difference between the two is that a chipper typically only has one rotating blade, while a chipper shredder has multiple blades.
The single blade on a chipper makes it better suited for breaking down larger pieces of wood, while the multiple blades on a chipper shredder make it better suited for smaller pieces of wood or leaves. Chippers also typically have a larger feed opening than chipper shredders, which means they can handle larger pieces of material.
If you're not sure which tool is right for your needs, it's best to consult with a professional who can help you choose the right tool for the job.