When comparing Default Folder X vs Hyperdock, the Slant community recommends Hyperdock for most people. In the question“What are the best power user tools for macOS?” Hyperdock is ranked 25th while Default Folder X is ranked 39th. The most important reason people chose Hyperdock is:
Hyperdock adds a lot of small improvements to the default mac dock, like better iTunes controls and calendar event previews.
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Pros
Pro Directory assistant Finder Integration
From the Open / Save file dialog, you can access your recent, favorite, and open folders. Includes a menubar item and can add to the Finder toolbar for quick access.
Pro New features are intuitive
Many of the features provided by Default Folder are quite intuitive and quickly become very useful. When a save dialogue is open, just click on an open Finder window to change the current path to that directory. Integrated Quicklook previews make selecting files in the list view much easier, and Spotlight tags can be added directly from the save dialogue.
Pro Lots of small improvements to the dock
Hyperdock adds a lot of small improvements to the default mac dock, like better iTunes controls and calendar event previews.
Pro Select individual application
Select individual application windows just by moving the mouse on a dock item, use mouse clicks to quickly open new windows and many more.
Pro Lets you easily find a window you have open
Pro Scroll up/down on menu bar to change size
Scroll up for full size.
Pro Snaps to corners
Cons
Con Not under active development
Hyperdock doesn't seem to be under active development and hasn't been updated since october 2014.