I personally find lecture notes superior to textbooks. Text authors frequently fail to edit their work down to the essentially material. When I am first learning a subject I want the key results. Once I understand the core ideas I can look up more details when I need them. Textbooks can be great for reference but as an introduction I like notes.

I am mostly familiar with studying math, economics and computer science. So I am not sure how my experience compares with people studying other subjects.