With regards to the type of music they release, there are also some really big differences. At this point in her career, I really feel like Ayu releases music with the primary intention of performing it live. That's why we get songs like The Show Must Go On, etc. -- they were built for live performances, not just to be standalone album cuts.
Hikki has never been a major touring artist, and so she approaches her music from a different standpoint. She is focused on the album itself as the output, the end-all-be-all.
And as for a hiatus...it might do Ayu good, but I'm not so convinced like everyone else. It's not like Namie really took a hiatus -- it was just that nobody wanted to see her, so she became really low-key. But she pretty consistently released music, and it wasn't until she just completely shifted directions that her popularity started to rise again. But Namie is an idol in the truest sense, so to be honest, she doesn't even belong in this conversation (and to be clear -- I like Namie).
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