<p>LaTeX. The main problem is just the learning curve. Note that it’d be much faster to type in: \int_a^b x^2 dx, than <a href=“fumble%20with%20mouse”>Ctrl + K</a> a (fumble with mouse) b. Not to mention, if you use stuff with Ctrl/Alt key combinations, you can only do so many symbols. With the right packages (eg. tikz), you can even easily do diagrams.</p>
<p>The main thing is that you need to get the hang of it and then get really fast at typing. It’s comparable to learning real shorthand or morse code. If you don’t type at least 90WPM and still breeze through symbols, then stick with the good old paper/pen method. If you took notes, you attended lecture, and you’ve got the lesson. The notes are suppose to work as a reminder, not as a replacement for the lecture. Most of your energy should be focused towards absorbing the material instead of transcribing it. After all, if you really forget something, the textbook is often better than any notes you took.</p>