One feature that makes Miro slightly more useful than FigJam is the ability to search/find keywords. Sticky notes can be difficult to dig through if you are looking for something in particular.
Use case: I interview a set of participants. I have 100s of notes. A month later, I’m working on a feature and I remember that one of our users mentioned something that was relevant to my work. How do I got back and find what they said?