For solo users on Windows who want a modern file management experience, choose Files. Its WinUI 3 interface, along with features like tabs and dual panes, offers a fresh alternative to the standard File Explorer, making navigation more efficient. However, if you need cross-platform support or advanced features like scripting, you'll want to look elsewhere.
If your primary goal is to identify and reclaim disk space, go with WinDirStat. Its treemap visualization allows you to see large files quickly, making it effective for managing storage. However, keep in mind that it has a dated interface and can be slow on large drives, so if aesthetics and speed are essential to you, Files might be the better fit despite its different focus.