If you're a Windows user looking to free up disk space, choose WinDirStat. Its treemap visualization makes it easy to spot large files, and being open-source means you can use it without worrying about telemetry or subscriptions. However, if you're working with very large drives, be prepared for a slower initial scan, and note that the interface feels dated compared to modern tools.
On the other hand, if you're a Mac power user or an automation enthusiast, Alfred is the way to go. It offers fast app launching and robust workflow automations, but remember that the most useful features require the paid Powerpack. It's a strong choice if you're comfortable within the Mac ecosystem, but if you need cross-platform support or integrated AI features, this won't meet your needs.