Lo po bia are stronger. For me, Lo po bia are cooler in terms of design,drip and haircut. They even have a position,anima for themselves. On the other hand, we can't rule out the Poe bidau's tech which is mainly gustang work especially shinsu black hole sphere ship, tiara's pen and even fake bracelet. With this tech, I believe, Poe bidau are stronger but interns of natural talent, I will have to go with lo po bia. I personally feel for lo po bia family as they could be one of top 3 family if they use their divine sea creatures properly and they have much more potential.
But again gustang received bracelet for over just 2 years which is nothing in the tower, but still managed to make those tech, hats off to him. But then again, I don't think they have that many shinsu back hole sphere floating carriers. And many small floating carriers self destruct while traumerai tried to capture it and when Michael went to receive boom,he only had one big floating carrier. So,in this war, I think its 50-50 for me. But again lore wise, gustang is also an end game villain. Will be exciting to see how this war turns out. I am personally in not favour of seeing one of the ten family leaders to die this soon.