I gotta say that along with Rogue, Syndicate is something of a redemption from the previous failures like Unity or Chronicles: China. And I love playing as Jacob. Evie is pretty much a by-the-book assassin - stealthy, fights lightly and somewhat gracefully, thinks everything through and always has a plan (Victorian female Batman amirite?), but Jacob is more appealing to me as he totally doesn't give a shit and just brutally beats everyone up. As someone who really sucks at stealth, this was a pleasant change. Also, he looks like a mixture of Tom Hardy and Wolverine which is absolutely badass.
(Jacob is my third favorite Assassin)