When comparing DaisyDisk vs "First Aid Utilities - Clean & Fix", the Slant community recommends DaisyDisk for most people. In the question“What are the best disk space analyzers for Mac OS X?” DaisyDisk is ranked 1st while "First Aid Utilities - Clean & Fix" is ranked 10th. The most important reason people chose DaisyDisk is:
While working on your Mac you create and download a lot of files, but rarely delete anything. As time goes by you have less and less room for your data. DaisyDisk finds those hidden unused gigabytes.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Helps find and delete files taking up HDD space
While working on your Mac you create and download a lot of files, but rarely delete anything. As time goes by you have less and less room for your data. DaisyDisk finds those hidden unused gigabytes.
Pro Awesome visualization of files on drive
DaisyDisk gives you a perfect overview of all the disks connected to your Mac, be it Macintosh HD, flash card, Thunderbolt disk or network storage. And does it in a beautiful way.
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.
Cons

Con Calculation based on 1000 not 1024
It's nice to have a base 1000 (MB, GB, …) calculation but it should be optional. Default should be 1024 (MiB, GiB, …)
Con Expensive for how often it is used
Con Commercial
One time fee on purchase, though no recurring costs.
