Sorry for the late reply, I don't know how to comment since I previously haven't watch them.
I'm currently watching Shogun. It's pretty good but I have a hard time remembering the faces of reccuring characters. So started from the middle until the end of episode 6, I open google a few times to better understand the story.
But I think One Piece is much more relaxing to watch. It's fun and there's cute Mackenyu. It also has less nudity/sex scene, and less one-sided violence/cruelty (there are two cruel scenes until episode 6; a man being boiled to death while slowly losing his original shape and life, and a man being cannoned until bloody, losing his limbs and then being beheaded).
Maybe you already watch them?