When comparing Wix 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 Wix is ranked 20th. 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 Functionality can be extended with community plug-ins
Wix has an add-on store, called the App Market, that includes community developed bits of functionality (such as comments, calendars and integrations with third-party services) that you can add to your site. The store includes both free and paid add-ons.
Pro Straightforward drag & drop interface
There's a selection of elements you can choose from in the sidebar that you can drag and drop into the page and edit. There are common elements such as text, images and buttons as well as less common elements such as blog or online store. All elements can be adjusted to some extent to fit your needs. For example, you can change things like the font, weight and style of text and even crop, adjust colors and apply filters to images.
Pro Personalized templates
Wix comes with various kinds of templates based on the users genre and needs, ranging from personal, blog, club, portfolio to commercial.
Pro Wix Code lets you add custom code and backends to your WYSIWYG site when needed
This means you can add custom interactions and API's to your site when needed, but do most of the editing in a GUI. This helps you avoid the need to redo an entire site if you need custom interactions. Also dead easy to connect a database and have dynamic components based on CMS updates.
Pro Great support
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 Generated html is very bad
A lot of duplicated css, a lot of absolute positioning.
Con Hard to migrate away
There isn't an option to self-host the site, but neither should there be a need to.