Masters and Fusion World are two different sets of cards in the Dragon Ball Super Card Game. Masters is like the "All-Stars" team, featuring characters from all over the Dragon Ball universe. It's like a big ol' party with all your favorite heroes and villains! On the other hand, Fusion World is more like a "Special Guest" appearance. It focuses on characters that have undergone fusion, like Vegito or Gogeta. It's like a secret club where only the coolest, most powerful fused characters get to hang out. So, which one is better? Well, that's like asking me to choose between my favorite pistachios and cashews! Both are awesome in their own ways. If you like a diverse range of characters, Masters might be your cup of tea. But if you're all about those powerful fused characters, then Fusion World is the way to go! Remember, it's all about having fun and collecting those sweet, sweet cards! Now, who's up for a game? Let's get ready to rumble!