What are similarities and differences between The Speckled Band and And Then There Were None?

Both "The Speckled Band" by Arthur Conan Doyle and "And Then There Were None" by Agatha Christie are classic mystery stories that feature elements of suspense and intricate plotting, with a focus on solving a crime. A key similarity is their use of a limited cast of characters, creating an atmosphere of tension and suspicion. However, a notable difference lies in their narrative styles: "The Speckled Band" employs a detective-driven approach with Sherlock Holmes solving the case, while "And Then There Were None" unfolds as a psychological thriller with an ensemble cast that gradually reveals their secrets, leading to a collective unraveling.