Not even Photoshop -- Photoshop is mainly about editing, well, photos, while ProCreate is about natural-looking brush painting. Photoshop certainly has brushes, but it's not even attempting any kind of naturalism. People don't generally "paint" in Photoshop. [Edit: from comments below, I stand corrected. Guess it's just the people I know.]
I'm not sure what you call that category of app -- painting apps? Natural-media painting apps? (Although you can choose to make them quite unnatural-looking too if you want.) Fractal Design Painter (later Corel Painter) invented the category I believe, way back in 1991.
EVERYONE uses photoshop in the painting/art world. Seriously, almost everyone. It's the best app for it, and the only reason people use others in my experience is because they're either free or a one-time payment. Or, because they're painting on a tablet, where (the full) photoshop isn't available.
>while ProCreate is about natural-looking brush painting
This is also not true. People use procreate because of the simple UI, nice gestures, tailored to iPads, for a one-off payment - and because its simply just the best option available on iPads. There's no difference in what you can do with brushes, or "naturalness" between them. If anything, photoshop is better at natural-looking brush painting. If you're wanting natural looking brush painting, also check out the lesser-known Rebelle: https://www.escapemotions.com/products/rebelle/about?//produ... - which is designed to more simulate real physical paint, not just in terms of brush patterns but also mixing.
I'm not sure what you call that category of app -- painting apps? Natural-media painting apps? (Although you can choose to make them quite unnatural-looking too if you want.) Fractal Design Painter (later Corel Painter) invented the category I believe, way back in 1991.