When comparing Joplin vs Trilium Notes, the Slant community recommends Trilium Notes for most people. In the question“What are the best knowledge base systems for personal use?” Trilium Notes is ranked 10th while Joplin is ranked 19th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Offline access
Pro Open source
Peace of mind that there is no malicious piece of software in the app.
Pro Encryption
Pro Cross-platform
Supports Windows, Mac, Linux, Android and iOS.
Pro Supports file attachments
Pro Supports markdown
Pro Supports tags for notes
Pro Web Clipper
Browser extension saves full pages, clean content, or screen selections to new notes.
Pro Optional CLI interface
Provides a CLI interface for terminal lovers.

Pro Supports multiple languages
English, French, and Spanish, Italian, German, Czech and many others.
Pro Active user forum with support from app creators
Support, troubleshooting, and new feature requests are easy to make at the user forum and you can contact the app creator directly.
Pro Dropbox support
Can sync using Dropbox.
Pro Nextcloud support
Pro Timed alarm reminder for to-do lists
Pro Note encryption
Pro Free and open source software
Pro Excellent WYSIWYG interface
Pro Attributes that can be assigned to nodes and inherited
Pro Graph of node connectivity
Pro Note versioning
Pro Synchronization with a server
You can set up synchronization but you need a server to do this.
Pro Database storage rather than files
This enables the tool to do a lot of things that would be difficult with plain text file storage.
Pro Archival functionality
Cons
Con Sync issues with Android
If update on Linux then sync on Android, sometimes the Android sync will duplicate or remove some journal notes. Seems to be a bug in the Android app. The Linux app alone without sync with Android seems to work well using Dropbox. But don't expect changes you make on Android to sync properly back to Linux.
Con Sync issue under Linux
The Linux client has a bug that requires the user to click the mouse frequently in order for sync to proceed. This bug has been open for a while.
Con Gargantuan memory footprint
1GB+ of memory for taking notes.
Con Old school interface
Con Bloated
This project is suffering from feature creep and uses a lot of memory for a note-taking app.
Con App Image launches very slowly
On Linux, you can only install via App Image, which take 5+ seconds to launch. I can launch LibreOffice in under two seconds.
Con Sync issues on Windows
No way to change account settings and sync easily corrupted.
Con Weak tag searching
Joplin can currently only search for a single tag at a time. None of the boolean operators (AND, OR, NOT) are available for use in searches. This greatly diminishes the usefulness of tags in Joplin.
Con Can't create tags from the mobile app
Con Interface can be confusing
There is a fair amount of flexibility to the interface but it can also become confusing, especially when some parts are not necessarily simple to use. Most of the basic features nevertheless are intuitive.
Con Database storage rather than files
This makes it a little less simple to work with (also has benefits).
Con Not markdown
It will import and export markdown but it does not store content as markdown. This isn't necessarily a problem if you don't need it.
Con Synchronization requires use of Trilium's sync server
This can be problematic to set up unless you have a web server that will support the requirements of this.
