When comparing Tone Syntax vs One Dark, the Slant community recommends One Dark for most people. In the question“What are the best color themes for text editors?” One Dark is ranked 6th while Tone Syntax is ranked 42nd. The most important reason people chose One Dark is:
Its wide hue range with good saturation/value use make a good enough contrast to skim the code fastly and not too vibrant to kill your eyes.
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Pros
Pro Limited colour palette
Very few colours - I make it even fewer by configuring two of the three colours to be the same.
Pro Customizable - you can set the colours to your liking.
Pro Colors are calm and easy to distinguish
Its wide hue range with good saturation/value use make a good enough contrast to skim the code fastly and not too vibrant to kill your eyes.
Pro Available for vim
Pro Available on a wide range of applications
KDE Plasma, VsCode etc...
Pro Available for Intellij IDEA
Pro Available for Atom clones and Sublime
Possibly for others too
This theme is a default one for Atom text editor.
Pro Default theme for Doom Emacs
Pro Calm blue background
If used with flux, it turns into warm gray during night.
Pro Available as a base16 theme
Pro Includes GUI themes
Cons
Con Default background colour is not dark enough (subjective)
Con Only available for Atom.io
Only supported by the Atom editor
Con Ports to other applications are not always accurate.
Con Kind of fadey
The colors aren't that bright (which may be good for some people).