When comparing Glary Utilities vs DoubleKiller, the Slant community recommends DoubleKiller for most people. In the question“What are the best software tools to find duplicate files?” DoubleKiller is ranked 18th while Glary Utilities is ranked 20th. The most important reason people chose DoubleKiller is:
I often run multiple sessions of DoubleKiller Pro, to find duplicate files among different sets of disks.
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Pros
Pro Tolerates multiple sessions
I often run multiple sessions of DoubleKiller Pro, to find duplicate files among different sets of disks.
Pro Flexible rules for finding duplicate files
The program can find duplicate files based on any combination of size, name, CRC, and byte-for-byte. It's possible to limit search to files matching a specific name or extension pattern (great for limiting search to certain file types) as well as using the same technique to exclude certain results. You can also tell the software to ignore any of combination of read only, hidden or system files as well as files of below or above certain size and archives.
Cons
Con Limited options for finding duplicates
The app finds files based on just 3 criteria - name, time and size. There's not even an option for checksums.
Con Can be overkill if the purpose is to only find duplicates
Glary Utilities is a suite of single purpose tools and to access one, you have to download all and potentially clutter up your PC.
Con No byte by byte comparison
While CRC checksums will be enough for most people, an option to check for duplicate files byte by byte would be nice.
[Edit] DoubleKiller does offer that option.