Which tool is most effective for cutting drywall sheets?

The utility knife is the most effective tool for cutting drywall sheets because it is specifically designed for this purpose. The knife's blade can easily score the gypsum core of drywall, creating a clean and straight cut without the mess and dust that can be associated with power tools. By scoring one side and then snapping the panel along the scored line, you achieve a precise cut and a smooth edge, which is essential for fitting drywall panels together seamlessly in construction projects.

While other tools like the circular saw or jigsaw can also cut drywall, they do not offer the same level of control and result in more dust and rough edges. A chisel is generally used for more detailed work or trimming, rather than cutting large sheets of drywall. Hence, for efficiency, cleanliness, and effectiveness in drywall installation, the utility knife is the ideal choice.