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Vim vs Emacs
Available on nearly all *nix environments (esp. servers)
Vim has smaller memory footprint.
Requires fewer keys for simple tasks
More active scripting community
Central repository of scripts, plugins, color schemes
Can be made portable
Knowing whether one is in "command mode" or "writing mode" is haphazard and confusing.
Vim is a much older editor compared to newer ones like Emacs.
Even the most trivial task is extremely unintuitive in vim.