NEW YORK — There is, as Tracy McGrady explains, a difference between the best player in basketball and the best basketball player. In his era, for instance, LeBron James was widely viewed as the greatest because of his all-around game. But presented with a hypothetical one-on-one contest against another contemporary, McGrady doesn’t hesitate to pick against LeBron. “Kobe is a one-on-one killer. That’s what he does,” McGrady says. The 43-year-old McGrady moves up in his chair. Only minutes prior, he was bubbling over news that the latest season of ‘Stranger Things’ was streaming on Netflix. The…