I'm with Jimbo. Pen and paper are still the best for taking notes.
When it comes to taking classroom notes, laptops and tablets create more problems than solutions.

Latex and other tools are useful afterwards, when you are going over your notes and turn them into understandable summaries in whatever manner you deem best for your personal study. I still did that with pen and paper, but that was onyl my preference. Latex would work there.

But for quickly taking notes, scribbling graphs and pictures and whatever in real-time, nothing beats pen and paper, unless you have an electronic equivalent which allows you to do the same, with only the added problems that are inherent in consumer electronics (data loss, theft, battery issues, software hangs, etc)