Old Ben - as your tank, i chose old ben over st han for end game viability. It may take you a long time to get GK and old ben can take you farther since his dodge chance is quite high and you have a slightly better chance of having taunt dispelled. However, st han giving turn meter is amazing early in the game, and you need scoundrels for credit heist.
Leia - she is the best overall end game character on that list and can be a good replacement for thrawn or han solo on a meta team if you dont have them yet. However, without r2 cloaking right before her turn, she wont get offense up amd her damage will be low.
Lando/Akbar - i cant really choose between them, but early on, Lando will be your star. He is also a necessary scoundrel. But you cant use his aoe against phoenix, dooku or rex teams. While akbar can be used with hermit yoda and cls, only a few people can swing an akbar lead in mid game, but not without atf and r2 and some more dps.
Replies
Leia - she is the best overall end game character on that list and can be a good replacement for thrawn or han solo on a meta team if you dont have them yet. However, without r2 cloaking right before her turn, she wont get offense up amd her damage will be low.
Lando/Akbar - i cant really choose between them, but early on, Lando will be your star. He is also a necessary scoundrel. But you cant use his aoe against phoenix, dooku or rex teams. While akbar can be used with hermit yoda and cls, only a few people can swing an akbar lead in mid game, but not without atf and r2 and some more dps.
Leia is a great DPS, but only works under rebels, great under CLS with R2.
Ackbar is a fleet commander, and the best if you don't have Thrawns ship. He is also a good lead in Territory battles.
Luke and Lando lose all viability end game.
Tarkin would like a word with you.
Heck, Mace probably would too.
Cap ships are fairly well balanced. You can make any of them work with the right squad.
I see all four in the top fifty of my shard (however my rank jumped up significantly since i switched from ackbar to thrawn)