Kotlin is a better languge than JS?
okay but for real:
• ktor offers you a type-safe api
• It's very feature rich
• You have the same api design for client and server
• You can use kotlinx.coroutines which is better than JS's way of doing async functions
cons would probably be that the JVM takes more resources than JS but i am not sure on how much resources NodeJS even uses. I still think you shouldn't use JS for server side stuff as it was never designed for it