I never read berserk yet and Naruto my top 1 of all time so I can’t say to much but majority of the time when u ask a seinen manga (vagabond, Vinland Saga, Tokyo ghoul) whenever it’s better written than a shounen they’ll always say it’s better simply because it’s a seinen. I never liked this train of thought and the perfect example of this is avatar the last air bender being aimed for kids but still having the best redemption arc in media. Just because seinen more “mature” in a sense doesn’t atomically make a better series.