When comparing Zenburn vs One Dark, the Slant community recommends One Dark for most people. In the question“What are the best VIM color-schemes?” One Dark is ranked 6th while Zenburn is ranked 11th. 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 Exceptionally easy for your eyes
Pro A battle-tested solution backed by decades of happy use
Pro Low contrast color theme
The low contrast will reduce eyestrain.
Pro Ported to a lot of apps and software
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 Quite low in contrast
While the low contrast reduces eye strain, some people may prefer the added legibility of a higher contrast.
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).