For digital art projects, I’m currently using a first gen iPad Pro 12-inch and an Apple Pencil. I love the larger screen size for drawing/painting, and the Pencil is one of the best input tools I’ve ever used. I just wish they had designed it so you can flip it around to the other side and automatically activate the eraser tool in your app like some others do.
Although I have used several, my app of choice is Autodesk Sketchbook. You get a mobile and desktop version for the same cost (I use it on my Mac at work too with a Wacom tablet). It also has a free version you can play around with to see if it’s a fit for you. Procreate is also an amazing app as well for the iPad Pro, but Sketchbook is my go-to app because I’m most comfortable with it (and because I can use it cross-platform).