For another n=1 opinion, I like Swift’s choice, even though it’s different from convention. It’s lighter, typographically. ‘${‘ draws more attention to the delimiters than ‘\(‘.

And yes, the delimiters could be made less obtrusive using syntax coloring, but not all tools will do that (e.g. when using grep on a code base)

Swift’s choice has the advantage of visually unifying the two cases where text in a string literal is interpreted as something other than the text itself. One is backslash escapes like \n and \\. The other is string interpolation.