Swift. Mostly because it’s by far what I’m most familiar with. Two things come to mind for what I most like about it. 1. Progressive disclosure: I found learning Swift to be simple since I didn’t have to directly concern myself with advanced features, but as I learned more I could take advantage of these more advanced features. 2. Clarity: I find Swift far more readable than most other languages. I think this is a combination of language features (argument labels for example) and consistency across the standard library and popular third party libraries. I think Swift finds a good middle ground between brevity and expressiveness; there’s never too much boilerplate to write, but the code is usually fairly self documenting.