When comparing tig vs Git Extensions, the Slant community recommends Git Extensions for most people. In the question“What are the best graphical git clients for macOS / Mac OSX?” Git Extensions is ranked 7th while tig is ranked 10th.
Ranked in these QuestionsQuestion Ranking
Pro Allows you to stay in the terminal
If you prefer to do most of your development inside the terminal, changing windows to move to a GUI git client can be annoying. Since tig runs inside the terminal, that's avoided.
Pro Vim-like bindings
Pro Available in Homebrew
Can easily be installed with homebrew simply by running
brew install tig
Pro Works on any platform
Pro Comprehensive interface
This application is FOSS, and thus it can be freely modified & distributed.
It comes with many plugins and you can build your own. Included by default are some very neat visualization tools for Repository metrics.
Pro Easy to add add action in the GUI
Right click to add a script to delete remote branch or tag...
Pro No registration at all
Doesn't require registration to use.
Con Steeper barrier to entry as compared to a GUI solution
Since you have to get used to working in the terminal (if you are not already used to doing that) and learn the commands, it has a steeper learning curve than GUI clients which are usually more intuitive and easier to grasp.
Con Poor UI
Rich developer experience but awful interface.