Clipboard seems to work well for me with this config:

    set clipboard+=unnamedplus

More details on that here: https://neovim.io/doc/user/provider.html#provider-clipboard

A couple of small things I really like:

    :set inccommand=nosplit

... this gives you a live view of substitutions as you type out a replacement e.g :%s/foo/bar/

    :term
    :vs term://bash

... these gives you a proper embedded terminal window inside vim.

Also, I think vim8 has it as well, but something people might not realise is you can use truecolor gui color schemes (not limited to 256 color) in the terminal with

    :set termguicolors

It also has a guicursor option for making the cursor display as a block or bar in the terminal depending on which mode you're in: https://neovim.io/doc/user/options.html#'guicursor'

Other than that, there's a more thorough list of differences here: https://neovim.io/doc/user/vim_diff.html