Best resistance team for TB?

It deosn't really matter to be honest...If you have Finn, Poe and Trooper you can pretty much freely rotate the other 2 as you wish....I've done 6/6 on every phase with different teams - usually always use Pilot and then Rey in the lower Phases (1-3) because she can pretty mush one-shot most people with her specials...and BB8 in Phases 4-6 - there Rey can't one-shot them but with Illuminated destiny and on the last 2 battles you can two-shot them - My pilot does 40k+ crits on his special and that's with potency mods....R2 can be useful with the extra stun here and there but to be honest Fin's stun is more than enough and if the expose engine starts going you don't really need stuns except maybe on the occasional Elite Snowtrooper...