I'm far more interested in Destiny. It has an FPS WoW feel to it, which is intriguing. It seems to have depth, scope, and ambition. Titanfall looks like a fun twitch shooter but I'm not the kind of person to get immersed in that type of game for a long period of time. On the other hand, I spent years playing WoW.
I was also a mostly solo WoW player, outside of 40 person raids, so I'm not worried about that aspect, either.
As far as sales go, I expect Destiny to be the biggest new IP of the year.