There are a few areas to consider when choosing between the two types of sliding and compound miter saws. Cost, size, weight, and range of motion. Sliding miter saws are bigger and heavier, but can cut wider material. They sit on rails which can impede the range of motion. Plus as they have more moving parts a slider will often cost significantly more. At the end of the day, it really depends on what tasks you see yourself using it for.