I was working on a server-side project written in Swift (not my language choice) for 2 years before switching to my current company where I mostly write Kotlin.

I was working on a server-side project written in Swift (not my language choice) for 2 years before switching to my current company where I mostly write Kotlin. There are some aspects where Swift is nicer in theory (e.g. Swift enums beat Kotlin sealed classes in terms of ergonomics and, while unnecessary for 99% of projects, we had some genuine use case for custom operators, working on a maths product). But other than those, it seems to be that Kotlin is the superior language in almost every respect. It seems to have none of the major flaws that Swift has, and the tooling is great, which is the exact opposite of my experience with Swift.