Momento Leaderboards and sorted sets are two collection types designed to cater to different use cases based on required longevity and scalability. Leaderboards are ideal for long-lived, highly scalable collections such as season rankings or "trending" lists, as they can handle millions of records over extended periods and utilize numeric IDs for element identification. In contrast, sorted sets are better suited for temporary data with limited elements, like match summaries or online voting systems, where the increment API and short time-to-live (TTL) are advantageous. Although there are some API differences, these distinctions are primarily temporary architectural limitations, and Momento plans to eventually merge the capabilities of both types, emphasizing the importance of selecting the appropriate collection type for specific use cases.