When comparing Gitbox vs GitHub Desktop, the Slant community recommends GitHub Desktop for most people. In the question“What are the best Git clients for macOS?” GitHub Desktop is ranked 12th while Gitbox is ranked 24th. The most important reason people chose GitHub Desktop is:
This is the official GitHub desktop client built by the GitHub team.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Clean, minimalistic UI
The UI is clean and intuitive. The top bar displays the current branch, buttons for pushing or pulling, the target branch and a search box for searching through the history.
The main view is divided into three parts: a file tree, a section that shows the modified files with details and a section that displays information about the remote branch.
Pro Easy to use
Gitbox is very easy to use. You can push, pull and commit all with a single click.
Pro Great GitHub integration
This is the official GitHub desktop client built by the GitHub team.
Pro Simple, streamlined GUI
GitHub Desktop uses an extremely simplistic two-panel view. It's not capable of complex historical visualisations like other GUIs, but it is very easy to use (especially for git novices).
Pro Supports pull requests
In addition to being able to seamlessly and easily integrate with all of GitHub's features, it also supports forking and submitting pull requests on any open source project hosted on GitHub.
Cons
Con Pricing
Con No diff-viewer
Diff-viewing requires an external tool.
Con Limited
Can't handle complex tasks. The Help Manual advises to use command-line Git instead.
Con Does not support multiple Remotes for a repo
Only allowed to assign one URL as remote. To manage/sync/fetch other remotes, use command-line Git instead.
Con Overly Simplified UI
UI that is designed not to support the needs of power and enterprise users. Management of more than five repos is next to impossible.
Con Buggy
Poster child for authors' programming ideology (FRP), likely the cause for the odd quirks and bugs it has.

Con Not free/libre
This application is proprietary, and thus cannot be modified or freely distributed.
Con No Linux support
There's no Linux version of this client.
Con Non-GitHub repositories are not fully supported
Since this is mainly a GitHub client, other repositories are not fully supported and with as many features and setting up a repo hosted anywhere else but GitHub is troublesome.
