Who is your favorite or who do you think is the best ally or ally group for the Rebels in a campaign? Use whatever parameters you prefer.
For my money, it's probably Luke Skywalker, for reasons of offense, defense, and general utility.
His attack pool and surge abilities are both very good, and he has the flexibility to saber strike against enemies with multiple black dice. Blue/green/yellow rolls an average of 3.3 damage, 5.8 accuracy, and 1.7 surges. Red/yellow rolls an average of 3 damage and 1 surge.
He is fairly good at surviving, with enough health to survive at least one hit from almost anything, a passive block to shore up his durability against masses of low-damage enemies, a chance to outright ignore an attack, and (uniquely among the ally options) the ability to heal himself with a surge. On average, he will get as many blocks as someone rolling a black die would, but he has triple the chance to cancel a surge and keeps the chance to roll a dodge.
Inspiring is a great utility effect, especially because it has no cost and no limit to the number of times it can be used in a round. Phenomenal ability. On top of that, he has Speed 5, which is a great perk to help him keep up with the Rebel heroes.
Simply put, Luke is the total package as an ally. At 10 points, he's a tad expensive. But his combination of abilities makes him more than worth it.
After Luke, I'd say both versions of the Saboteurs seem worthwhile. I don't know about Han (cost), Chewbacca (cost), or either version of Trooper (efficacy). I'm excited to see what R2-D2 and C-3PO bring to the table when Twin Shadows arrives. I expect them both to be cheap utility allies.