A miter gauge is a great tool for crosscutting on the table saw, especially if outfitted with an auxiliary fence. But wide pieces force the miter gauge off the front of the saw table, creating an unsafe situation. And long pieces tend to drag on the table, making cuts inaccurate.
For these reasons and more, most serious woodworkers make a custom crosscut sled for their saw. A sled does everything the miter gauge does, but better. With its broad base, long fence, and double runners, a sled carries workpieces of all sizes smoothly and accurately past the blade with no wobbles, as opposed to dragging them. This makes the sled the more accurate option for workpieces of all sizes, but especially