I'm currently testing out GIMP and Krita; so far I find GIMP more feature-rich but I also have some quality concerns when it comes to the lines that GIMP draws. And I'm not sure if I'm doing something wrong.
For example these are circles drawn in GIMP, the inner one with a paintbrush stroke and the outer one with regular line stroke:
(notice the strange edge algorithm even though the circle is perfectly symmetrical)
And these are the same circles drawn in Krita:
(They look much more professional and Photoshop-like)
I'd like to keep using GIMP over Krita but if there is no way to improve the line quality then I'll have to switch. Any tips?