Krita is nice to use, but for simple things I find Gimp's filters more useful. It now has much better scaling filters than Krita and the colour adjustment filters are useful, especially colour temperature adjustment and auto white balance I use a lot. Also some aspects of Gimp's UI are still superor, for example some filters in Krita only allow adjusting the parameters using text boxes, where in Gimp you can use a slider to interatively adjust each parameter with the mouse.

regarding the colour adjustments what do you think of G'MIC ? It integrates quite well in both GIMP and Krita and all the filters can be edited easily with sliders / text boxes / etc..

G'MIC is extremely useful and the algorithms in it seem very high quality. Indeed it works great in Krita does make up the difference for the most part, though I don't think it directly replaces the examples I mentioned in Gimp that I like, for example I can't see a generic scaling filter in there. I'm not sure it has a colour temperature adjustment specifically, either.