My preference would be both. Take notes during the lecture, and then receive the professor's outline. This would allow me to focus and reinforce lecture material during the first iteration, while also seeing where the holes in my knowledge reside (e.g. what I considered important during the lecture/note-taking vs. what the professor deemed important).
At that point, I can refactor my notes including the professor's outline, adding details I missed or elaborating on parts of the outline that might have been sparse.
At that point, I can refactor my notes including the professor's outline, adding details I missed or elaborating on parts of the outline that might have been sparse.