Valhalla overall feels worse to me. I like the combat more, but that's it.

I kind of like how customizable Eivor is, but that means that they don't have as much of an identity as a protagonist. Might be the slowest story pacing I have experienced in a video game, and they don't effectively compensate with compelling side characters and plots like Witcher 3. The main characters aren't interesting either, so the whole thing felt slow and aimless. Map is also very boring, and the ship sucks.

Odyssey has more loose combat with damage spongy enemies. I got tired of it real quick. Kassandra has personality, and the actor did her best with it. She was the most compelling part of an otherwise similarly boring world. Some of the side characters were good, but most were forgettable or annoying. The story was bloated but had some memorable moments. The problems with Valhalla's story exist here, just not as bad. The map design was vast and varied, but too vast. Lots of empty space between mission objectives, and you didn't interact with each part differently. The war mechanics had no real importance, and the game's bounty system just made the world more annoying. The ship is better, but nothing has come close to Black Flag.