I had opportunities to study with both NETs and TETs when I was in high school. I think my TETs were far better than NETs because they seemed to be well-prepared when they taught in class. Besides, they also knew which parts of English pronunciation were problematic for us. They could explain difficult pronunciation features well. As for NETs, they did not prepare their teaching when they came to class. They had us watch videos on YouTube the whole period and taught nothing. Though they had good pronunciation, they couldn’t deliver their instruction effectively.