Not sure if either is more idiomatic than the other. Both look fine to me.

I prefer to avoid threading in cases like this, but I don't think that opinion is broadly shared.

If you’re only nesting one fn inside another, it’s likely six of one half a dozen of the other as to which style you use. I tend to use arrows for three or more operations in a row, just for easier readability.

I also tend to use threading macros for 3 or more operations. In the examples above I don't see any readability improvement from using it, it rather makes it more complex.

only using -> for 3+ sounds reasonable

@U02CV2P4J6S, also be aware of these recommendations: https://guide.clojure.style/#threading-macros https://guide.clojure.style/#threading-macros-and-optional-parentheses https://guide.clojure.style/#threading-macros-alignment I find the style guide to be a source of many good examples.