If you can get Odyssey, you can entirely skip the Origins. Both games have almost the same mechanic with Odyssey basically being an improved version of Origins. I also went with Origins anticipating Ancient Egypt. I had just finished Far Cry: Primal and was excited to play more historic games. But the AC:Origins is not that much ancient Egypt except for the location. The pyramids were built at around 2500BC, and the game is set in ~50BC. Also, I expected a better origins story, on how and why the creed formed. The endgame twist is super awesome, but the whole origins can be explained in 3-4 lines.
It is definitely not a bad game, and I enjoyed playing though it. But when I got Odyssey just after finishing that, it felt like going through the same game again, but in a different location. If I had to do it again, I would haven't played Origins and directly gone for Odyssey. However, if you play Origins, and don't plan to continue with Odyssey anytime soon, definitely go for Origins. Again, not a bad game, and one of the best game in AC franchise, but I will suggest rather watch the story of Origins on YouTube, and skip directly to Odyssey.
