Sonic Boom will for sure. The average consumer won't know it's a crap game, and they'll buy it just because it's a Sonic game. Most people who are interested in Watch_Dogs probably already have it on another platform (such as myself).

Sonic Boom will because its a better known franchise and it wasn't delayed six month.

Sonic Boom? It will be sure close.

I think they will sell similar numbers. 300k+ lifetime for each.

Technically, watch dogs deserves 0 sales.

Sonic will likely sell better. It has the whole exclusivity deal going for it.
Watch Dogs delay and the fact it was released on other consoles beforehand will easily eat at the potential sales it could have had. This and the general mediocre consensus for the game.
Sonic does not have good reviews either mind you, however it is exclusive, and the Sonic die hards are likely to pick it up. Plus uninformed parents will likely pick it up for their children for christmas to go alongside the Mario Kart bundle or something to that effect.

Sanic.

I want sonic to sell more... because screw ubisoft but... As much as I don't want to admit it.... Ubisoft did a good job on the Wii U version. -throws up-

technically both deserve 0 sales

Sonic depending on the cartoon.