Wouldnīt be the red laser better? I am not sure if itīs some "rule" but I think red is universal distress color. So you should have better chances of not being ignored when you signal with the red laser as opposed to the green one.
However in the case of signaling after activating PLB it shoudnīt matter since the SAR personnel would be looking for any visual signal (red or green) from you while trying to pinpoint your location.
But without help of a PLB it could make a difference.
Correct me if I am wrong.