When comparing Gingko vs TagSpaces, the Slant community recommends Gingko for most people. In the question“What is the best cross-platform note-taking app?” Gingko is ranked 21st while TagSpaces is ranked 46th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro You can customize colors
Pro Allows focusing on one piece of information at a time
Since Gingko documents are "trees", they are always organized on the go. And since everything is written in cards, it is possible to focus on one chunk of content at a time.
Pro Easy to overview
Despite the complexity of the tree structure, it's always clear where you are, and how to quickly add your thoughts.

Pro Markdown support
All formatting is done via Markdown.
Pro Non-linear
Non-linear notetaking allows you more flexibility, freedom and creativity.
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 Limited free version
The free version is limited to 100 cards and 10 documents. Depending on how you use it, this might not be enough.
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.
Con Setup could be more user-friendly
