CoffeeScript follows a more common style: double-quoted strings for interpolated values and single-quoted strings are literal.
Re:Airbnb JavaScript Style Guide
by rhgraysonii on Friday July 03, 2015 @10:10PM
(#9828859)
Also: Ruby/Opal (also transpiled)
My personal style guide is to copy Erlang: double quotes for text, single quotes for programmatic strings (atoms/symbols). The single quote is slightly more convenient to type on a qwerty keyboard, but text regularly contains single quotes (apostrophes). It also provides a semantic visual shortcut.