Scala is light-years ahead of Kotlin. Kotlin spends a lot of time promising things and talking about things they plan to ship – and then never ship it. Scala

Scala is light-years ahead of Kotlin. Kotlin spends a lot of time promising things and talking about things they plan to ship – and then never ship it. Scala devs are honest, tell you exactly what's planned and then ship it. Tooling is great, the library system is amazing, and people get things done. If you are happy with Java, keep using it (or try Kotlin – which is nothing more than a slightly less verbose Java). If you want a better language–use Scala.