I haven't used Krita much but found that the brushes were really nice to use.

GIMP is definitely a bit disorentating and complex if you've never used it before. After spending a couple of hours of proper study to get to grips with it though, the power and flexibility of it is awesome.

As with the recent Adobe/Photoshop news, I understand why this has been done and the sort of user that it's for, but FOSS graphics and photography software on Linux is so good now that I don't think this will have the impact it might have had a few years ago.