Both languages ​​are fantastic and offer advantages that make them excellent choices for developing leading mobile applications. However, Java is better for large applications with many features and capabilities that must work on all platforms, including Android, iOS, Windows, or Linux. In addition, Java has mature libraries that support this application development well.
Kotlin developers for hire build performance-critical applications, such as those that need to run smoothly on older Android phones. Kotlin is modern, with a streamlined and efficient design that will perform better for scaling.