What are the key differences between Canon EF-M and EF-S lenses, and which one would be more suitable for my camera?

The key differences between Canon EF-M and EF-S lenses are their compatibility and size. EF-M lenses are designed for Canon mirrorless cameras, while EF-S lenses are for Canon DSLR cameras. If you have a mirrorless camera, EF-M lenses would be more suitable. If you have a DSLR camera, EF-S lenses would be the better choice.