
My question is two-fold, actually.
- When would a different System upgrade be superior?
- When should you spend your Target Lock instead of gaining a free Crit?
Concerning no. 1, I think we have a difficult time answering as a community.
Concerning no. 2, the question becomes "How many dice should I re-roll to get a greater expected value than 1 damage?" And that's a question I can answer.
The TIE Advanced is capable of rolling 2, 3, or 4 dice (if you take Expose or Opportunist).
Each attack die has a 50% chance of coming up damage, unless you have further modifiers.
A re-roll on 3-4 misses is better than using the free crit.
If you have a Focus Token, each die has a 75% chance of coming up damage.
A re-roll on 2-4 misses is better than using the free crit.