My argument is pretty simple and works for both PC vs PC, PC vs NPC, NPC vs PC and NPC vs NPC.
You look at the abilities, etc that can affect the roll from the Attacker's perspective and apply them to the roll. These could be done in any order of the attacker's choosing.
Then its the target's turn to attempt to fend off the critical, at which point you then apply the target's abilities, talents, etc.
An argument could then be made that the critical hits the target has previously suffered would be applied here. I would also suggest that these abilities, etc could be applied in any order the target chooses.
If this is the case, the only issue then is to know what the actual result is as many of the abilities give an actual numeric value, where Precision Strike changes that.
Edited by GM Hooly