IMHO Krita is more of a drawing app (that's what I use it for) and GIMP (I wish I could make a wish upon the monkey's paw and get it renamed... To Libre Graphics Manipulation App. Or -- LiGMA) is more for editing stuff
When I tried to use Krita a few months ago I couldn't set the white point in the levels tool. I looked it up and the tool apparently doesn't exist. That makes it awful for processing scanned artwork in my workflow.