Hey there, first of all you should farm ships where you already got high geared pilots. Like if your playing with a phoenix squad it definetly makes sense to go for the ghost and phantom 2 ship. So basicly at the start, you want to focus on some ships that got high early value for ya. But to answer ur question more percisely
Geonosian Trio are quite Awesome:
Geonosian Soldier
Sunfac
Geonosian Spy
Biggs Ship - must have in these meta in my eyes.
Tie Advanced (vader ship)
Tie Silencer (super easy to farm pretty good) -kylo ren unmasked ship
Slave 1 (boba) - really hard to get.
Imperial TIE
FO TIE
here are some hints: focus on 6!! 4* Dark Side ships - u need them for the Executrix 5* Challenge.
Then focus on 6 5* Ships (light or Dark doesnt matter)
You really want to finish these before you hit 78. Because ur able to go for the fleet ability material challenge Tier 3 on level 78 - which has a chance to drop ZETA mats.
So Your Setup should look like:
Biggs 5* or up
TIE Silencer 5* or up
Imperial TIE 5* or up
TIE Advanced 5* or up
Ghost 5* or up
Phantom 2 5* or up
This is only an example for those of you who play with phoenix. Just stick to the golden rule - a ship is only as good as it pilot - and you cant go wrong.
May the force be with ya guys