I've been using GoodNotes 5 since it had been launched. I found that my handwriting was not as good as in Notability. The ink in GoodNotes 5 seems to lag. I feel like it tries to bend my stroke all the time and I'm quite annoying this. I've tried to set the pressure sensitivity to low, medium and high, however, it stills bending everytime. So I have to write slower in order to make a beautiful handwriting and sometimes it wastes a lot of time!

Ps. I've used GoodNotes 4 before too. The GoodNotes 4 doesn't have this problem.