I finally found the time to test and wanted to share my conclusions with you.
The vertical artifacts on the curves in the previous photos, were caused by some (Orca) slicer setting. Most probably the jerk is reduced too much somewhere (orca slicer changes jerk depending on line type). When using a Super Slicer, these artifacts are much less visible (constans jerk).
In my stuff I found 1.8 degree steppers. I decided to compare the prints with previous 0.9 degree steppers, the design of my printer allows me to change motors without changing belt tension. I prepared an object that requires line printing at 45 degrees to have clean information on each stepper. I present the results in the photos below:
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And here I am very surprised, because both prints are almost identical and I can't tell which is better. I always thought that 1.8 motors were better.
On flat surfaces at some speeds you can clearly see the reflection of the belts. The arches and ends show artifacts with a smaller spacing than the belt. I understand that it is the superimposition of two effects, the reflection of the belt and the ringing?