When comparing Grav CMS vs Nikola, the Slant community recommends Nikola for most people. In the question“What are the best solutions for a personal blog?” Nikola is ranked 11th while Grav CMS is ranked 13th. The most important reason people chose Nikola is:
Nikola posts may be written in a variety of formats. You can write posts in HTML, with all the expressive power of HTML and CSS, and still have the benefits of a site-wide theme and navigation structure.
Specs
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Pros
Pro Fast, easy to use
Very fast, easy to update, - has admin panel for noobies or just edit markdown files for posts.
Pro Does not use any database, a complete flat Elise CMS
Database being a point of vulnerability is completely removed from the equation with it's flat file approach.
Pro HTML input
Nikola posts may be written in a variety of formats. You can write posts in HTML, with all the expressive power of HTML and CSS, and still have the benefits of a site-wide theme and navigation structure.
Pro Host on any web server
Nikloa sites are static files, and thus may be hosted on any web server that allows you to upload your own files. This lets you use simple and inexpensive hosting providers and still have a reliable site.
Pro Write in reStructuredText and Markdown
You have better choices for markup than raw HTML.
Pro Free open-source software (MIT license)
Cons
Con Not User Friendly
Require some technical knowledge to use