The following iPads/iPhones are equipped with high-resolution front-facing cameras:
iPad Pro 11-inch (2nd generation)
iPad Pro 12.9-inch (4th generation)
iPad Air (4th generation)
iPhone 11 and newer.
Keep in mind that Apple frequently releases new iPad models, so it's a good idea to check the specifications of the latest models available at the time you're looking for the best front-facing camera.