Yeah, Phantom as an RI once you max its ability. I'd also go for Cassian's U-Wing pretty early on. Great for dealing with enemy HT and Falcons with its dispel. You can start Wedge until you get something better to take his place. XB is also decent in that fleet since he has an assist call and can deal % Max Health dmg. These are all stopgaps though, for when you can switch to Ackbar leading Biggs, HT, Han's Falcon, with Phantom, Ghost, Cassian's, +1 for RI or Ackbar, Biggs, Bistan, Han's, with RI Phantom, Ghost, Cassian, HT.
