Personally, I use Doom Emacs with ElixirLS for development. But my general sense is that the majority of Elixir developers now use VSCode (and VSCode is significantly easier to get started with than Emacs). So VSCode is my general recommendation (with ElixirLS and not vscode-elixir since it is not maintained).
With Elixir, it is generally reasonable to use generic project-wide (and sometimes single-file) search and replace to refactor variable names. Or at least reasonable enough that no-one’s created tooling to do context-aware refactoring. But if someone were to implement refactoring in ElixirLS that would be much appreciated and could then be used across a large variety of editors.
