A track saw and a sheet of insulation board is probably a safer choice for breaking down sheet goods than trying to wrestle the sheets onto and across a tablesaw by yourself. That is doubly true if your saw is not wide enough to use a rip fence when you are breaking down the sheet goods. Free-handing cuts on a TS have led to lots of injuries and suits against the saw manufacturers.
If you already have a good circular saw, there are adapter plates to pair it with guides so that it functions as a track saw.
If you already have a good circular saw, there are adapter plates to pair it with guides so that it functions as a track saw.