Actually, I find this question... inherently troubled.
Ackbar teams benefit strongly from having non-Rebel members. Specifically, a non-Rebel tank and support. Maybe two non-Rebel tanks or supports. That's because every Rebel is a candidate for an assist, and you probably want that to be your attackers.
But, from this team...
Admiral Ackbar, Raid Han Solo, Cmdr. Luke Skywalker, Princess Leia, Wedge, Biggs, R2D2, Old Ben, Sabine Wren, Stormtrooper Han.
Admiral Ackbar (L), Raid Han, Princess Leia, R2-D2, ST Han. Mostly characters you want attacking, who also have at least one move that can call an assist. Han over Ben as the tank because his basic is... less bad.
Cdr. Luke, Wiggs, Ben, Sabine is the B team, just plain smashing things behind Ben. Wedge lead could be okay, too.