How does Dart compare to Kotlin? I was planning on learning Kotlin, hoping to use it for server side development as well. But somehow now I have a feeling that

How does Dart compare to Kotlin? I was planning on learning Kotlin, hoping to use it for server side development as well. But somehow now I have a feeling that developing mobile flutter apps might be more pleasant (pure feelings not based on any real data). Does Dart offer good performance, asynchronous IO and all those things?