My favorite Assassin's Creed game has to be Black Flag. I Ioved the story and the setting even though I went in thinking I was gonna hate it. Its lush open world offered a plenty of activities to indulge in. Also, it introduced fast travel as we know it now in the franchise. Moreover, all the characters were memorable, the game did a lot to help the immersiveness (shanties, tavern activities etc.), and the soundtrack was awesome.
I'm really looking forward to Valhalla cause a lot of people who worked on Black Flag, Origins, and Revelations are working on this game (Darby McDervitt is a narrative lead which makes me really pumped to see what they are going to do with the story and how it's going to fit in the franchise as a whole)
Also, I'm a broke student and really want to win this giveaway haha