I'm fully onboard the Neovim train. Lua is a much better language than vimscript and there's a lot more interest in Neovim so there's more interesting packages that people create. Regular Vim is probably fine if you aren't gonna put as much effort into customizing it and if you just stick to the tried and true.

I use nvim all the time for code exploration & figuring out what i need to tell the AI. Invest in tools and packages that let you navigate your codebase quickly