Best Rebel squad

For pure rebels right now, it's probably Ackbar (L), Leia, Lando, HRScout, STHan.

I'd be really interested in seeing how Wedge (L), Biggs, Lando, Leia, STHan works out. It seems like droids 2.0, especially if you speed boost STHan up enough to ensure that you get the first turn.

And the Han from the Rancor T7 raid ?

If wedge ever gets working right I think a wedge (l), lando, Leia, Biggs, sth/hr solider would be great. Lando and Wedge would get close to 50% TM when using AoE. Leia would also get close to 50% TM when triple Hit with basic could be more but not sure how her level 8 basic works.