When comparing Material Theme for Notepad++ vs Gruvbox, the Slant community recommends Gruvbox for most people. In the question“What are the best color themes for text editors?” Gruvbox is ranked 2nd while Material Theme for Notepad++ is ranked 47th. The most important reason people chose Gruvbox is:
Three different variants are available, each with different contrasts.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Based on popular themes
The theme is a port of another popular Sublime Text theme and hence is tried and tested
Pro Actively developed
The theme is quite new and is in active development.
Pro It's free
Pro Improves Notepad++'s user interface
Greatly improves the Notepad++ UI by using clean and modern colors.
Pro Multiple contrast options
Three different variants are available, each with different contrasts.
Pro Very easy on the eyes
Both the light and dark version have a reddish background for a consistent look when toggling between them.
Pro Have light and dark version
Dark background has brown-yellowish retro colors, light background is yellowish with pastel highlights.

Pro Made ready for multiple text-editors
Ports for Atom, Sublime, TextMate and Emacs and other text editors are available.
For a full list of available ports.
If you are using a Jetbrains IDE.
Pro It can be customized in detail
Size of the tabs, icons of file types, contrast of the color schemes, accented colors, indentation in the sidebar, sizes of the status bar and dozens more.
Pro You can go all day with Gruvbox
Cons
Con No list of supported editors
Tried to find out which editors are supported, but could not find the information.
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