Went to the 神姫プロジェクト.攻略wiki and made a little bit of research between SSR Eidolons (Drew Behemoth) and my SR Beelzebub. xD

Shows min and max damage and health, so is this a correct enough assessment when judging unit's power? I'm keeping Beelz due to the ridiculously higher max dmg and health, and someone shared her potential if I'm going Dark~

Is there any reason one would pick an SSR Eidolon over ANY SR Divine Princess (Kamihime)?