• Both are community managed free and open source web applications with a powerful wiki.
• Both support Wiki markup. Please see (if) Why Wiki Syntax Is Important to your project.

• MoinMoin uses files for storage whereas Tiki uses the MySQL database. In future versions, MoinMoin will have a DB storage option.
• MoinMoin is in Python whereas Tiki is in PHP.
• MoinMoin is focused on being a great Wiki (which it is!), whereas Tiki is more of a Content Management System / general purpose wiki.
• MoinMoin is GPL, Tiki is LGPL. The main difference between the GPL and the LGPL is that the latter can be linked to (in the case of a library, 'used by') a non-(L)GPLed program, which may be free software or proprietary software.

Compare them at http://www.wikimatrix.org/compare/Tiki-Wiki-CMS-Groupware+MoinMoin

Number of contributors who made changes to the project source code each month.

Number of commits made to the project source code each month.

• MoinMoin
• TikiWiki vs MoinMoin