Planetes, Vinland Saga Recommendations
Written by the same author, they have the exact same character design and character development and stories are somewhat similar even though the settings are really different.
Both series are authored by Yukimura Makoto, so the art style and the themes are very similar. While Vinland Saga has a more singular focus on pacifism and nonviolence, Planetes is more episodic in nature. Each chapter develops the characters and explores different concepts, rather than telling one contiguous story like Vinland Saga.