From my experience Miranda is, hands down, the best wingman for Biggs and Braylen. Homing Missiles gives her power of Corran and Wes in one attack ( lot of dice and negating of token use). Give her Extra Munitions and she will have two insanely strong attacks - also in meta with Defenders turrets are really good.
As much as I want to run Norra, I have a really hard time justifying using her when Miranda gives me a significantly better chance of doing something like wiping Howlrunner off the board before the rest of the swarm gets to fire or knocking a Stealth Device off on the first attack. Norra's definitely beastly in the last game if you can get her 1v1 against someone, though.