When comparing diff-so-fancy vs vimdiff, the Slant community recommends vimdiff for most people. In the question“What are the best diff tools for Git?” vimdiff is ranked 7th while diff-so-fancy is ranked 13th. The most important reason people chose vimdiff is:
It's practically vim, this means that the whole interface is mouse-free, this increases development speed significantly since you are only using the keyboard.
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Pros
Pro UNIX command line differ compatible with version control tools
Pro Mouse-free interface
It's practically vim, this means that the whole interface is mouse-free, this increases development speed significantly since you are only using the keyboard.
Pro Lightweight
Since it's inside vim, it's very lightweight and fast. It fires up quickly and it does all operations painlessly.
Pro Helpful to people who work a lot inside the terminal
Using command-line tools (vim/git) keep you stick in the terminal.
Cons
Con Not for people who are not used to vim
Since this is basically a vim feature, it's clear that people who aren't used to vim and it's keyboard-based interface would find it very hard to work with vimdiff.