DaisyDisk is a visually appealing disk space analyzer designed for macOS, focusing on usability and aesthetics, while WinDirStat is a free and open-source tool for Windows that offers detailed disk usage statistics but may be less user-friendly. DaisyDisk is ideal for users who prefer a more graphical representation and a streamlined experience, whereas WinDirStat is better suited for users seeking depth of information and control over their file management.