I think my favourite Assassin's Creed game so far was Odyssey. I grew up reading about the fantastical works of the heroes of Greek legend, and in secondary school specifically took classes in Latin and Greek so I could learn more about classic culture. We even travelled to Greece at one point to see some of the most legendary sites like mount Olympos, the Oracle of Delphi, Olympia, the Parthenon etc. I have a great affinity with the time period and loved running around in it.
Valhalla also looks very interesting to me. I'm a history buff in general and the history of England is one of the most dynamic and entertaining in all of Europe. I hope it's portrayed faithfully in the latest game.