When comparing SpaceSniffer vs WinDirStat, the Slant community recommends WinDirStat for most people. In the question“What are the best tools to discover disk usage?” WinDirStat is ranked 8th while SpaceSniffer is ranked 13th. The most important reason people chose WinDirStat is:
GNU Public License (GPLv2).
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro high customization
you can change its element, animation, behaviour, look, and styles
Pro visualization scheme
effective and modern disk space check
Pro Very fast
Pro Free / Open Source
GNU Public License (GPLv2).
Pro Color codes by file type
You can sort the list in the extension column (file type) globally or from parent folder selected. This is very helpful in case there are files of a specific type that you may not be aware of that's taking up too much space. Also, the colors correspond to the visual section.
Pro Lightweight
Pro PacMan Progress Bars
Cons
Con Windows only
Con No tree view
there is no tree view, only visualization scheme
Con Slow
There are faster programs.
Con Classic UI
interface are old and cluttered