In Android development, Kotlin has a lot of traction, as it compiles to practically every platform. It is more compact and expressive than Java, and transitioning between languages is simple. Although Kotlin includes built-in null safety support, it has a steep learning curve and a smaller development community. Java is simple to learn, versatile, and has a large open-source community. Also, Java applications are small and simple to optimise. Java, on the other hand, is a verbose language that necessitates more code, which increases the likelihood of errors.