When comparing Merge Conflicts plugin for Atom vs vimdiff, the Slant community recommends vimdiff for most people. In the question“What are the best git conflict resolution tools for macOS?” vimdiff is ranked 3rd while Merge Conflicts plugin for Atom is ranked 6th. 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 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.