When comparing "First Aid Utilities - Clean & Fix" vs Disk Inventory X, the Slant community recommends Disk Inventory X for most people. In the question“What are the best disk space analyzers for Mac OS X?” Disk Inventory X is ranked 3rd while "First Aid Utilities - Clean & Fix" is ranked 10th. The most important reason people chose Disk Inventory X is:
It is absolutely free and released under the GPL.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Zip repair
Can repair broken Zip archives.
Pro Extremely fast
Self-explaining, removing clutter and duplicates is extremely fast.
Pro Graphic overview
Graphic overview of a disk shows detailed information about the content.
Pro Free & Open Source
It is absolutely free and released under the GPL.
Pro Works in High Sierra and above
Pro Allows ordering disk by size
This way you can find what is taking most of the space.
Pro Offers choice between analyzing whole disk or just a specific folder
Pro Absolutely matching with Windirstat
Cons
Con Commercial
One time fee on purchase, though no recurring costs.
Con Crashes on Ventura, when closing the app
But you do not need it so often, so it is ok.
Con Crashes on Sierra
Crashes on Sierra when resizing windows.