When comparing Spacegray 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 Spacegray is ranked 8th. 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 Balanced contrast
Most color themes have either too much contrast or too low contrast. Spacegray is much better balanced in contrast (see what I did there)
Pro Ported to Sublime Text
Pro Ported to Atom
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 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).