You cannot contact us too early in the design process. Contact us with any design questions or send us a sketch or drawing of your project. We will be happy to help. A Great question, but one without a clear-cut answer. Each material has at least one clear cut advantage over the others, so the answer depends heavily on the application.
Ferrites have the least expensive raw materials.
Alnicos have the highest operating temperature and least sensitivity to temperature. Samarium-Cobalt magnets are most resistant to demagnetization. Q I am redesigning a product that uses ferrite magnets. Our goal is better performance. Most likely, you will see a little better performance, but not nearly as much as expected.