Thank you for the links. The first one has both adjustable diopter for each eyepiece and adjustable interpupillary distance. The second one does not mention adjustable diopter, nor do the pictures seem to show it. That could be an important difference if your eyes are not equal.
As for the 20mm v. 22 mm field, I don't see that as a very significant difference. They are both wide field. Lens quality will make a bigger difference. Can you check reviews? Neither description actually describes image quality.
In my experience, the only way to decide between good microscopes is to test them out.