When comparing MDwiki vs Xwiki, the Slant community recommends Xwiki for most people. In the question“What are the best open source wikis with native markdown support?” Xwiki is ranked 1st while MDwiki is ranked 2nd. The most important reason people chose Xwiki is:
More than [600 extensions are available](https://extensions.xwiki.org/xwiki/bin/view/Main/).
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Possibly more secure on web server
Due to the lack of a built-in editor MDwiki may be less susceptible to spam and defacement compared to other options when served from a web server.
Pro Doesn't require a web server
MDwiki is a self-contained JavaScript app that is very fast and can run in some web browsers such as Mozilla Firefox.
Pro Extensions
More than 600 extensions are available.
Pro Playground
You can try out XWiki in the Online Playground.
Pro Hosted
Cloud and Hosted offers are available.
Cons
Con External program must be used for editing
A separate program must be used to make changes to documents as MDwiki lacks a built-in editor.
Con Requires additional permissions in Google Chrome
Supposedly, you can get it to work in Google Chrome by modifying JavaScript permissions, but these same changes may decrease security.
Con No SQL Server support
