All of your work in Procreate can come out as PSD, native. Procreate also has incredibly high-resolution canvases that allow you to print out your work in massive sizes, without ever skipping a beat.
And if you can't find a tool in Procreate to fit your needs, you can just create your own tools. With Procreate, you're getting access to exclusive tools, such as the dual-texture brushes and immediately responsive smudging tools to create the perfect masterpiece. It's one of the most powerful sketching, painting, and illustration apps that you can buy for your iPad, and it's built for professionals and works flawlessly with Apple Pencil.
If you're looking for the best drawing app for iPad to rule them all, you can't go wrong with Procreate.