Vocally, beyonce is very textbook imo. Like, I can't pick out the thing that stands out most for her voice. She has a good register, her intonation is very consistent, great stamina, and a solid belting range. She kinda does everything 'really good', a jack of all trades in a way. Of course if you separate individual aspects, there are folks who are better but her collective skillset kinda gives her an edge.