What's the best prequel movie?

I'm curious to know, when it comes to prequel movies, which one do you consider to be the absolute best? Is it one that expands the lore of a beloved franchise in a satisfying way, or perhaps it's one that gives us a deeper understanding of the characters we've grown to love? Or is it simply a visually stunning and well-crafted film that stands on its own merits? I'd love to hear your thoughts on what sets apart the best prequel movie from the rest.