When comparing Momentum vs xbrowsersync, the Slant community recommends xbrowsersync for most people. In the question“What are the best cross-platform productivity tools?” xbrowsersync is ranked 2nd while Momentum is ranked 8th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Specifically designed for GTD
Pro Automated Next Steps
Next steps have a separate view. Tasks can be updated sequentially or parallel.
Pro Projects and Tasks can be endlessly nested
You can nest multiple projects with tasks, there is no limit.
Pro Has an offline mode
No permanent internet connection needed.
Pro Cross-platform
Web-based, progressive-web-app (PWA).
Pro Realtime synch
Data instantly updates on all devices.
Pro Clean design
Lots of space helps focus on the tasks.
Pro Use this extension on all majorly used browsers: Chrome (and most up to date 'chromies' as well as Firefox and Android
Pro Anonymous
No sign up required and no personal data is collected.
Pro Encrypts your bookmarks securley with a method you can check for yourself
Pro Developer seems to be actively developing the app
See here.
Pro It is free and the developer announces that it will stay this way, neither are there any ads involved
Pro xBrowserSync adds descriptions and tags to new bookmarks automatically.
Speeding up workflow cataloging important meta-data automatically.
Pro Know your way around docker? xBrowserSync is easily self hostable.
Not only will it benefit the people who set up docker containers, if opened to the public, even more people will be able to quickly get to know xBrowserSync.
See here.
Cons
Con Beta interface is confusing for first-timers
The interface is very opinionated (this is a good thing). But it is not obvious how to map user's own GTD variant onto the one the author has in mind. Maybe after it is in production, there will be better on-boarding.
Con No native apps
Con In Beta (development)
Con No iOS support
It doesn't support anymore iOS.
Con Does not sync passwords
If youre afraid due to the lack of password syncing with xbrowser, this problem is easily fixable by using myki password manager. It supports all major operating systems with secure features that work alongside xbrowsersync perfectly. myki is available as a chrome extension, and for android, iphone, mac, windows, and more!
Con Doesn't support new Firefox for Android
Maybe not the developer's fault but since using Firefox as main browser, the cross platform niche can't be satisfied. Will be looking to jump ship once the extension is added to the very limited pool Firefox Android currently has.