Big Barda vs Donna Troy & Starfire

round 1, team. round 2, team, due to starfires napalm esque attack. 
"Starfire's body continually absorbs ultraviolet radiation, which she then converts into the energy that powers her starbolts and her ability to fly. Starfire can also store a massive amount of this energy to use all at once in a devastating attack, as witnessed by the Outsiders."

Round 1 I would still be willing to bet to bet the team is capable of taking down Barda, of course it won't be easy. Barda has a slight edge in strength, but speed goes to Donna and Starfire in spades. Skill I say all three are fairly even as well.
 
Round 2, morals off Starfire is extremely dangerous, as she showed when she finally stopped holding back in battle with Indigo. Being able to damage the ship as well as speed blitzing. Donna is also. As for the Megarod, it's only real feature the two can't deal with is it's ability to open up boom tubes, the energy blast's are fairly weak. The team with morals off and superior speed should take this. (As Barda is reliant on her aero-disks)

Team wins

Barda wins bya bfr

Eh Starfire solos currently

Team