To be honest, I don’t for the life of me know why all the obsession with caps. Not that they don’t make a difference. They definitely do. But so do diodes, and for a lot less money and with less risk of changing tone or response balance. Seriously. Get some nice fast smooth HEXFREDs and see.
If you want to do caps, study the link above. That’s what I did. Pick your caps based on how they sound from reliable sources like HHF. Unless you can find someone here who has compared and written as many evaluations (which I seriously doubt) that’s the way to go.