Perhaps the visual aspect is responsible for a bit, but I know that even notes that I never reviewed after the fact but handwrote had more sticking power in my head than when I typed.
Both my partner and I used tablets for notetaking through college and found it at least analogous if not superior to handwritten notes, since it became easier to link topics that you might otherwise need to back-reference on paper that could instead just be a big arrow. Lots more freedom to use arrows, visual linkages, and asides when you weren't constrained by 8.5x11 paper (which maybe allows a bit of that but otherwise forces linearity, more or less).