Unless the defenders fire missles as well, 1-2 missle turrets aren't much of a threat. At full shields, a bomber will shrug off a single missle, and they aren't hard to outrun.

I always put AA turrets in, given a choice. Even if missle turrets were equally good with airborne vehicles, I find AA turrets much better with capers.

But, I was thinking, If the enemy optimizes their air defense (with AA) turrets, then they are leaving themselves open for a tank assault, where their AA turrets will be of no help.