That depends a lot on what you want. Money? Kotlin. Self-fulfillment in what you're doing? Probably still Kotlin but not Android. Modern technologies? Almost certainly JS, but I would encourage keeping a path out open. Challenges and constant new solutions? JS.
For much the same reasons as @jmfayard
mentioned: The Android SDK is huge and full of traps. Traps which (unlike JS) result in crashes and the App just outright not running. Kotlin as a language is great, but Android as a platform is incredibly frustrating.
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That depends a lot on what you want. Money? Kotlin. Self-fulfillment in what you're doing? Probably still Kotlin but not Android. Modern technologies? Almost certainly JS, but I would encourage keeping a path out open. Challenges and constant new solutions? JS.
Why is that, why not Android?
For much the same reasons as @jmfayard mentioned: The Android SDK is huge and full of traps. Traps which (unlike JS) result in crashes and the App just outright not running. Kotlin as a language is great, but Android as a platform is incredibly frustrating.