From what I have heard about the Milflex with it’s paper instead of plastic philosophy, I think that you may struggle to beat it, when it comes to transparency.
For sure, my Studio crossovers use a massive Miflex copper cap in the tweeter circuit, and a Miflex bypass caps in both circuits. They have a really lush, laid-back sound that feels very fluid and organic without ever sounding "dark" or lacking for texture/clarity. Danny's stock crossover sounds really good too, but has a more crisp, solid feel to it, but you still get some hints of that lushness, but not to the same extent, as mine.
But I'm still excited to see how these new caps perform either way.