Here's my thought on aca/emmet-ls: Emmet support based on LSP.
This is the greatest nvim emmet plugin I have tried. In the past I had tried the vim plugin a few times and just could not get a good flow with the keybindings and found it confusing for my occasional use.
emmet-ls just uses lsp-completion, so its the same flow as other completions.
You can try it out by installing with