In Origins, you will explore ancient Egypt, while Odyssey is set in Greece, where you embark on missions to defeat enemies. Additionally, Ubisoft aims to take advantage of the historical settings in the game, allowing players to travel freely through the Discovery Tour mode without any fighting or bloodshed.
However, the file sizes are quite large, 42GB for the Origins Discovery Tour and 50GB for the Odyssey Discovery Tour, so be sure to clean up your hard drive before downloading.
Source: PC Gamer, translated by Gearvn