When comparing DiffMerge vs vimdiff, the Slant community recommends vimdiff for most people. In the question“What are the best folder/file compare/diff tools for either OSX, Linux or Windows?” vimdiff is ranked 4th while DiffMerge is ranked 8th. 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 Completely free
DiffMerge is free of charge to download and use for both commercial and open source projects. There's no license needed. However, people who want to contribute to the project monetarily can do so.
Pro Cross platform
DiffMerge is cross platform and is available for all major operating systems. This means WIndows, Linux and OSX
Pro Folder compare
Pro Three way merges
DiffMerge supports three way merges.
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 Startup time can be slow
DiffMerge's startup time can be quite slow sometimes.
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.
