I made a post here on how to use macvim installation as the default vim commands (vim, vimdiff, view, etc.)

In short do:

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curl https://gist.githubusercontent.com/kflu/c492dfcba2a32965918f920b046f8d19/raw/aa6da495ee8579afd0ec8235911b10d31ec5555f/mvim_as_sys | sh
echo "== Don't forget to add ~/.local/bin to PATH"

The script is here