Scala is complex and interesting but perhaps more research than industry. If your goal is to learn fancy programming languages, I would go with Scala. If your g

Scala is complex and interesting but perhaps more research than industry. If your goal is to learn fancy programming languages, I would go with Scala. If your goal is to do side projects not in Java but still using the JVM without thinking too much about the programming language, I would pick Kotlin. I recently enjoyed learning Rust, but it's more low level which you may enjoy or not.