[WernherVonTrapp]

I've used a 45° angle on approach sometimes. It all depends on the situation; whether a slow convoy or fast TF, position of escorts, early/late detection of target, weather conditions, etc..

I prefer a 90° angle (more like 80 - 110 range) not because it offers a better firing solution but because it facilitates more options for my escape. E.G., along the 90° angle range, I can turn port or starboard in about the same amount of time than if I was approaching at 45° (relative to target's approach) which would make turning to port more time consuming. At least, this is what I've come to feel comfortable with.