All of the Affinity products are top notch. I wanted a simple vector tool and ended up liking Affinity Designer so much I picked up a course to learn it more in-depth. The best part is their pricing model doesn't suck, so I'm happy to pay for their wares.
In November 2020, Gimp 2.10.14 didn't work well or at all on Big Sur. The issues got workarounds and bugfixes, but there are still complaints about performance. https://gitlab.gnome.org/GNOME/gimp/-/issues/5917