I'd say it's somewhere between Sequence 5, 6 or Sequence 10.
While sequence 5 was still pretty tutorial-esque it had some pretty fun missions and I still remember my reaction when I got out of the general store and the game showed the date "March 5, 1770", that being the first moment I properly recognized. The anticipation of what was gonna happen was great.
Sequence 6 is just so open and overall it has some fantastic missions. The tea party and William Johnson's assassination were pretty damn fun, and I just enjoyed every bit of this sequence.
Sequence 10 has some fun missions (even though there's that one side-objective which annoys the hell outta me), it has some pretty good character interaction and story moments.
Currently playing: Spyro the Dragon 2, Morrowind, The Legend of Zelda: Oracle of Seasons/Ages
It's hard to pinpoint one from memory, so I'll just say "whichever one had the most naval combat."
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Whichever one you start working with Haytham.
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Soul Calibur V Mains: Aeon, Cervantes, Algol, Ezio, Yoshimitsu, Dampierre
For a game that I eagerly awaited for so long, it wasn't bad and I did enjoy it but nothing really stands out in memory as something epic or that I really liked more than anything else. I guess the naval battles were pretty cool but as far as an actual whole sequence... dunno.
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