When comparing CrcCheckCopy 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 CrcCheckCopy is ranked 11th. 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.
Specs
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Pros
Pro You do not need concurrent access to the folders you are comparing
Files are scanned and their CRC32 hash is stored in a extra file. Using this file you can validate if another folder is identical with this one, even if the other folder is on an offline backup, like your dad's computer.
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 No GUI
No GUI, so if you cannot handle the MacOS terminal or the Windows command prompt, there are other tools to use to compare folders.
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.