So, I'll finally get to play Mission #2 this week. I'm not sure which side I will play as I'll let my opponent pick. It probably means I'll be Imperials, but you never know.
If I go with Rebels, I think Thane Kyrell might be a good one to go with. I'm not sure how best to load him up, but I think Tail Gunner would be good. Maybe a Torpedo? That way I can perhaps get a Focus and a TL with a Proton Torpedo on him.
If I go with Imperials, I almost think a Tie Adv. V1 would be good. The free Evade and TL would be nice. Maybe with a missile? Either that or Tie Advanced X1's would be good. The Adv. Targeting Computer would help get through Reinforcement. Crits always help.
I think as the Rebels you have to decide whether you're going to flee or hunker down and fight while the CR-90 charges up for a battle.
If you flee (my preferred choice), you need things to distract the Imperials: blockers, ion guns, bombs... anything to earn you a turn or two of extra time to get away.
If you fight... you're going to need to deliver heavy, fast damage to keep the incoming ships off the refueling container and the CR-90. Three Y-Wings with TLT? Lothal Rebel and some A-Wings? Not sure... that's why we ended up going with the flee option
In Mu0n's campaign group, two imperial players have already picked dual phantom squads for this mission, because the rebel player is restricted to generic pilots (which don't go over PS4). A PS5+ phantom is very hard to deal with in this circumstance, and can be even harder to deal with if they're packing sensor jammers, which are very bad news for CR90s, which can't take focus actions.
A good rule of thumb for any escort ship is to maximize your aggression and/or blocking. Right now I think the best bet is probably a trio of HWKs carrying TLT and RecSpec. They can punch through a lot of defense, including cloak and sensor jammer. They'll be effective against the forced imperial TIE forces and most other ships Imperials will be tempted to take.