When comparing QTTabBar vs TagSpaces, the Slant community recommends QTTabBar for most people. In the question“What are the best file managers for Windows?” QTTabBar is ranked 14th while TagSpaces is ranked 38th.
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Pros
Pro Middle click/Ctrl+click to open new tab
Pro Allows you to simply add tabs to File Explorer which suit the design
Pro Plugin support
The program can be enhanced further by plugins for a variety of purposes.
Pro Good drag and drop options
Pro Preview popup buttons
Pro Ctrl+arrow keys for navigation between different tabs
Pro Ctrl+tab to go from tab to tab
Pro Open source
TagSpaces is free and open source making it easily extendable with the help of extensions.
Pro Your can choose your cloud file storage
Using only files and no databases let's you make the decision with which cloud file sync service to use, making sure your notes are made available on other devices and platforms. It works great with Owncloud, Nextcloud, Dropbox or Google Drive.
Pro No web service or database lock in
The backend is simply the directory and file structure on your harddrive.
Pro No cloud
TagSpaces is running completely offline, sending no data to any cloud based service, unlike many Evernote alternatives.
Cons
Con Options menu almost unusable on some high resolution displays
Options menu almost unusable on some high resolution displays, for example Surface Pro 4 2736X1824 and 225% magnification (scaling issues). Interestingly, works ok on external display 3840X2160 with 150% magnification.
Con Possibly abandoned project
Not updated since 2019-3-24. No response from developer. Is the project dead?
Con It renames your files in order to tag them
The positive side of this drawback is that this way the tags are easily transferred to other platforms by simply syncing them.