There are many products in this space on the app store, and probably one to suit every taste. Procreate is more capable - layer blending, design your own brushes. Then there's Brushes, beloved of David Hockney. Plenty of notebook apps too: Notability is particularly versatile, Autodesk has SketchbookX, SketchClub and SketchPad are fun, SketchShare is multiuser via wifi, ArtRage is .... OK better stop.
Paper has a pleasing feel but the minimalism won't suit everyone.