All I need is good netcode. Fortunately, I'm not seeing tell tale signs of bad player syncing which were clearly evident even from the earliest footage of AW and Black Ops 2. No one bullet deaths, and no weird enemy player death animations that look like they skipped a bunch of frames. Though, I'm only basing it on about 10 minutes of MP footage. If there's video of knifing gameplay that would be a big indicator as well.
Overall, I'm probably going to go with BO3 this year. I'm not a big Star Wars fan. Even though that trailer looked more exciting the truth is, when netcode isn't an issue, I usually enjoy COD most. Even with AW being the shittiest, after the recent improvements I find myself playing it more than Battlefields.