Well if you do decide to give Mudbox a spin you'll definitely need more brushes, you can never have too many. I have hundreds I've collected, created, or purchased over the years. You can convert photoshop brush files (abr) to png and then invert them in an image editor and load them into your Mudbox stamp library. I use this to convert abr to png

https://abrmate.software.informer.com/1.1/

This might be a bit off topic but Carrara Pro has a really good 3d painting tool built into it, it's the software I started 3d painting with. Don't recall that its tablet friendly though, it's been years since I've had it installed. You can also use photoshop brushes there after converting them. No lie, the painting tools are outstanding really, once used to navigating the rooms environment, even as aged as they are. Has a layer system that's very robust too, and paints stacked UVs effortlessly. There's a small bit of text editing of a file to add brushes to your brush presets library but it's easy. Additionally pre weight mapped Poser figures work there natively. Unfortunately Carrara is dead in the water development wise, it's a great piece of software, or least it used to be, and a damned shame it's withering away in such a manner... but I digress.