Comparing Aimer and Jean-Ken Johnny in terms of their songwriting can be quite subjective as they both bring unique styles and strengths to their music. Aimer is known for her emotive and heartfelt lyrics that resonate with listeners on a deep emotional level. Her songwriting often delves into themes of love, loss, and self-discovery, creating a sense of vulnerability and authenticity in her music.
On the other hand, Jean-Ken Johnny, the guitarist and vocalist of MAN WITH A MISSION, is known for his energetic and dynamic songwriting that blends rock, pop, and electronic elements. His compositions often feature powerful riffs, catchy melodies, and anthemic choruses that are designed to energize and uplift the audience.
Ultimately, the "better" solo writer would depend on personal preference and the specific aspects of songwriting that resonate with you as a listener. Both Aimer and Jean-Ken Johnny have their own strengths and appeal, so it's worth exploring more of their music to appreciate the diversity and creativity they bring to the J-Pop music scene.