I actually rank the White Court as the most powerful. By far. Their mix of power and lack of weaknesses is essentially a perfect fit for the modern world.
While they are not consistently as powerful physically as the Blacks or Reds, they also are not as vulnerable as the Blacks or Reds. I think it's a problem when you can't go out during the day or are vulnerable to children armed with Super Soakers backed up by a Priest.
And, the Whites can throw down with the Blacks or Reds, just in short bursts. Meanwhile, objects of faith or sunlight or holy water or garlic have no impact on them. A White with a full charge can absolutely tank a tremendous amount of damage, provided it isn't instantly lethal.
All of the vampires can control humans to a certain degree. Blacks can create Renfields. These are berserkers, but not good at anything else. The Reds were also able to control some human institutions -- of broken and weak governments. We aren't entirely sure what means that they employed, but my impression is that it was cartel tactics of bribes, violence and intimidation. Lara wields influence over the U.S. Govt., as she demonstrated by getting US Navy evac for Harry's wounded at Chicken Pizza.
The proof, in the end, the Blacks are all but destroyed (by the Whites, btw) and the Reds are destroyed (by the soon-to-be White Consort).