Krita has improved a lot in the 8 years I’ve been using it and is a good all rounder although it is not as good if you want the natural medium simulation like you get in programs such as Rebelle.
Edit 2024: I use a Huion Kamvas 22 inch Plus tablet which works fine with Krita, much better than the Ugee did although I got good use out of the Ugee while I had it. Krita has improved a lot in the 8 years I’ve been using it and is a good all rounder although it is not as good if you want the natural medium simulation like you get in programs such as Rebelle. I still use it more than Corel Painter or with Corel Painter 2023 depending on the result I want to make.