When comparing Gitit vs Roam Research, the Slant community recommends Roam Research for most people. In the question“What is the best cross-platform note-taking app?” Roam Research is ranked 27th while Gitit is ranked 36th.
Specs
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 In place page creation / linking with brackets or hashtags
Pro Rename a page and all everything that references it renames as well
No broken links!
Pro Each bullet point can be either linked to, or included in full in any page (including the page it originated on. Yay transclusion!)
Pro Shift click on a link pulls up the link in a side panel without navigating you away
Pro Each bullet point on a page is zoomable as it's own 'wiki page'
Pro Helpful slash (/) commands while editing for autocomplete, TODOs and more
Pro Easy page merging.
Pro Explicit linked references included on every page at the bottom
Pro Supports markdown
Pro Bi-directional links
Pro Graph overview allows you to easily see how nodes relate
Pro Supports in place datalog queries
Pro In place editing
Pro Supports hiccup syntax for HTML snippets
Pro A default place for "Daily Notes" means not having to worry where a new note *should* go.
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 No mobile app
You can port Roam to Hermit, but there is no offline capacity.
Con No established pricing model, this could get expensive later
Rumored to be upwards of $30/month
Con No offline mode
The information can be accessed on the browser offline, but you cannot edit it.
Con Very expensive pricing model, no 'free' tier
For what still feels like beta-software, it's pricing model is very expensive in comparison with competitors that generally offer free tiers for example.
Con Forces you to edit with markdown, rather than wysiwyg
This issue is made worse by super basic formatting bugs, like if you want to for example unbold some text with control/cmd-b, it rather double-bolds it (e.g. it becomes bolded text), making the non-wysiwygness even more messy.
Con No vim mode
