help me to decide.

i just finished ac odyssey, and now im searching new game to play, so my question is Assassins Creed Valhalla Or Immortals Fenyx Rising, which game should i buy ? im playing on Xbox series S , the most important thing for me is how long it takes to finish main story and gameplay(mostly fighting mechanics), thank you.

Both are great. if i would choose it would be AC valhalla

I haven't played Valhalla but AC games in general trigger my OCD where I need to get every last hidden item. That in of itself will consume a lot of time.