Here's some of my terrible maths:
Average Damage against 3 Defence Dice: 3 Attack Dice: Focus Token: 1.125 Predator: 0.625 Predator and Focus Token: 1.3125 Predator (against PS 2 or lower): 0.875 Predator and Focus Token (against PS 2 or lower): 1.5 Target Lock: 1.125 Target Lock and Focus Token: 1.6875 Crack Shot: 1.375 Crack Shot and Target Lock: 2.125 Crack Shot, Target Lock and Focus Token: 2.6875 2 Attack Dice: Focus Token: 0.375 Predator: 0.125 Predator and Focus Token: 0.5625 Predator (against PS 2 or lower): 0.375 Predator and Focus Token (against PS 2 or lower): 0.75 Target Lock: 0.375 Target Lock and Focus Token: 0.75 Crack Shot: 0.875 Crack Shot and Target Lock: 1.375 Crack Shot, Target Lock and Focus Token: 1.75 Crack Shot and Howlrunner: 1.125 Crack Shot, Howlrunner and Focus Token: 1.5625
You can see from these results that Crack Shot can make for some awesome damage, but that over the course of a few rounds with a 3 Attack Dice ship, you're probably better off with Predator.
However, combining Crack Shot with Howlrunner can get that extra point of damage through on a 2 Attack Dice TIE Fighter or TIE/FO that you're really not likely to get with Predator. Crack + Howlrunner is a deadly combination.