I only discovered Krita recently, but holy shit does it fill the Photoshop void very well. The UI isn't the same as PS, obviously. But I find it much easier to navigate than Gimp's UI. And Krita is surprisingly feature-rich.
I like Krita. But to be honest, after years and years of using GIMP, I ironically have nothing but trouble trying to rewire my brain to do things any other way. The same problem that many people have when moving from Photoshop to GIMP.
Also, i fundamentally need DDS files, which Krita (AFAIK) doesn't handle.
I've just found out about kitra right now but from the site it says it's mostly focused are drawing and stuff like that so would photo editing be netter with something like rawtherapee?
If you're working with RAW files, neither Gimp nor Krita are the tool for you.
I use Darktable to adjust global things like brightness, contrast, white balance and so on, then export to Krita or Gimp for more granular local modifications.