"More Famous" is an arbitrary concept. There is no way to properly gauge which one is known by a majority of the general public without doing extensive polling.
Since that data does not exist any answer provided by the participants of this site would only be opinion based and not a substantial answer.
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Jaden Smith is younger so chances are no! Adele is a singer and a performer so the one that is more popular is ADELE jaden hasn't been nominated for a lot awards. Adele is also older than Jaden so she has been around longer. So to answer your question Adele is more popular. Make sure to also research this to!