But they noticed that most do not go back to their notes as much as they should so a general advice, while typing is easier hand-written helps you learn and retain better using less exposure.
Assuming a class isn't already being recorded (many/most at my university were), the best solution is probably to record audio on your phone and take hand written notes. Then go back and transcribe the hand written notes while referring to the audio in to the computer.
Well, I started taking LaTeX notes in-class specifically because I couldn't refer back to handwritten notes later; my handwriting is atrocious at the best of times and when taking quick notes it was just unreadable. However, I did have to keep a notebook for diagrams as well, and my typed notes always needed cleanup afterwards. My eventual process was to type up a first draft before class while reading the material, supplement them with lecture material, then finish them after class. This won't work for everyone, but after I started doing this I would actually use my notes, whereas before I wouldn't, since I could actually read the darn things. Plus, I can type ~2.5 times faster than I can write.
If you're going to do that, your best bet is probably to take handwritten notes on a tablet while recording using an app that syncs the two.
I sometimes do this; it's also nice that I can snap a photo of a slide with the tablet and insert it into the notes.
TBH, I mostly type notes, in part because my handwriting is really bad and, if I'm going to write something up about an event cutting and pasting is easier. OTOH, I sometimes prefer to have fairly cursory notes knowing that I can always go back to exactly what was said if I need/want to.
Assuming a class isn't already being recorded (many/most at my university were), the best solution is probably to record audio on your phone and take hand written notes. Then go back and transcribe the hand written notes while referring to the audio in to the computer.