When comparing Gitit vs vimwiki plugin for vim, the Slant community recommends vimwiki plugin for vim for most people. In the question“What is the best cross-platform note-taking app?” vimwiki plugin for vim is ranked 23rd while Gitit is ranked 36th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Lots of export formats
Giti has a multitude of formats that it allows to be exported, including LaTeX, ConTeXt, DocBook, RTF, OpenOffice ODT, and MediaWiki markup.
Pro Supports markdown
Getit supports markdown, a plain text formatting syntax that is designed so that it can be read by HTML.
Pro Free and open source software (FOSS)
Licensed under GPLv2 so you can download source code and customize to meet your needs, provided that you know or are willing to learn Haskell.
Pro Can be used collaboratively by multiple people
Pro Renders math
Using MathJax.
Pro Internal link makes it easy to create a knowledge network
Pro Comfortable for Vim users
Has a very minimal learning curve for people already used to Vim, as the preset shortcuts are very easy to learn and don't conflict badly with other Vim behaviors.
Cons
Con Requires Haskell
On some Linux platforms a binary package for Haskell may not be included in the standard repositories. So, it will be necessary to compile Haskell from source code or find a non-standard package repository, which may seem like a hassle if you don't use Haskell for anything else.
Con Limited to use with vim only
vimwiki is a plugin for vim, so you won't be able to make use of it if you're not a vim user (and don't want to be).