Sui (SUI) focuses on scalability and efficiency using a unique consensus mechanism called Narwhal and Tusk, which separates data dissemination from transaction consensus. It uses a Move programming language for smart contracts, emphasizing safety and flexibility. Sui also employs horizontal scaling to handle increasing load, offering low-latency for quick transactions. It's developed by former members of Facebook's Libra/Diem project, offering a credible and experienced team.