That is the question.
Of this post.
Specifically, I'm talking Rebel Control lists, like Stress Wing.
That runs 3x B-Wings with Tactician, in addition to a Y-Wing with an Ion Cannon Turret and R3-A2.
In this case, what is more valuable: having the shots be out-of-arc, or the addition of the Y-Wing's primary attack, and the possibility of double-stressing with R3-A2?