Having now played both the mythology games, what are you thoughts if any that AC Odyssey does worse than Origins? I can't think of many things but I think the resource gathering system is better in Origins.
I think it's just a matter of taste ultimately. I enjoy the grandeur of Origins a lot more than the more provincial Odyssey, but at the same time the gameplay loop is tight for Odyssey while it's very simple in Origins & therefore more forgettable. The systems in Odyssey actually have a point and keep me engaged in using & developing them while for Origins at least 2/3rds of them were pointless. I also enjoy the graphical step up of Origins over Odyssey, it's just more crisp & detailed, with better LOD & draw distances. Another slight deficit for Odyssey is that it's sometime too contemporaneous in the narrative & characters, which throws me off a bit because it's a lot more obvious than in Origins and frankly I find the forced nature of it distasteful. It's just gender quotas gone wrong, instead of following Witcher 3's lead where the characters feel very much as belonging to that world & time period, often times in Odyssey you feel like you're seeing 2019 people LARPing. Not the worst Ubisoft has done, but not the best either. It's a minus either way, but not a big one. It's a fine line to tread though, and could easily have tipped over (like what happened with New Dawn, or for Bioware with DA:Inq, ME: Andromeda, etc.)
I'm still slightly biased towards Origins but truth is, they're both fantastic games and are definitely under my best games of all time list. I remember day dreaming years ago when I was playing Age of Mythology & the like obsessively about just such games and today I can actually play them, it's truly a dream come true.
I wouldn't want to pick one over the other, and I'm glad I don't have to!