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I originally switched because neovim was more polished, had better plugins and Lua config files. I then never had a reason to go back

I think I first switched because neovim supported the XDG config location, I could have ~/.config/nvim/init.vim instead of ~/.vimrc.

I ended up switching for plugin support. Other than that, unless you want to use Lua for your config files, I don't see a reason to switch either.