There isn’t one right way to apply foundation—the best tool for the job depends on a few factors, including the formula you’re using, its finish, and your desired coverage. Generally speaking, brushes provide a more full-coverage application, while sponges can make buildable products easier to blend and buff.
Pro Tip: You can use makeup sponges to apply powders—not just liquid and cream formulas. Simply dab the tapered end into the powder and press it onto your skin.