I think if they combined elements from each of the 3 they'd have something excellent. The Predator Bow from Origins was absolutely OP but still made standing outside fortresses and guided arrow sniping every single Roman inside fun as fúck. Bayek was probably the best protagonist of the 3.
I liked the Sparta v Athens stuff in Odyssey as well as the mythical elements like the Herculean feats and Atlantis. Had the worst characters of the 3 though. Was also simply too big. You'd grind and grind and grind through all the icons on the map and feel like you were making zero progress.
Valhalla had the 2nd best protagonist and the best additional character arks. Ceolbert's in particular was a very good and impactful story.