Origins has terrible (or at least bad) combat while Odyssey's combat is quite awesome, it makes you feel so strong with those Warrior Abilities and Assassin Abilities, Hero Strike for example...
Origins kind of wins when it comes to parkour while Odyssey wins when it comes to everything else pretty much: gameplay, graphics, story, exploring map and even characters. Sure Bayek is alright but Alexios is just much better, Alexios is such a badass like Ezio and Altair, IMO he's quite an underrated character that deserves more attention because he's among 3 best characters in the whole franchise.
Playing Origins doesn't feel bad but it's just not powerful like it is when playing Odyssey, when I play Odyssey I feel like a GOD while I feel like some ordinary warrior when I'm playing Origins.
That's the whole difference, Odyssey is a GOD level and an awesome game while Origins is kind of weak and it's on the ground eating the dirt while Odyssey totally wins the competition.
DraganPRO2000's comments