There are two main types of miter saws: single bevel and dual bevel. Single bevel miter saws can only cut in one direction, while dual bevel miter saws can cut in both directions. This gives dual bevel miter saws more versatility, but they are also more expensive. If you only need to make cuts in one direction, a single bevel miter saw will suffice. However, a dual bevel miter saw would be a better choice if you need to make cuts in both directions.