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I think it ultimately depends on your personal working style. Some advantages to vim are:

+ it's simple UI (all text-based)

+ it's lightweight

+ it is modal (which can be easier if you're a touch typist)

+ you never have to use the mouse (just like what lukeqsee said)

+ lots of plugins exist to enhance the functionality

Hope this helps!

+ it's much more dynamic with integration of compiler than any other editor (I know) and supports even integration plugins for gdb

+ it will help you prevent mistypings during other actions (thanks to insert mode) and sometimes I think it even helps to write better code.