Right now, it's safe to go with Bambina. Who knows what both can do when they are serious though.
I have no idea who they are, I just think that the Hax counter and supernatural angels have a weakness that if someone knows how they function, you can stop their powers to be the reason why Yhwach might be able to draw or win here by feats.
They're from Tenchi Muyo. 1 of them was strong enough to contest a LHW. That's not a very fair comparison.