I agree with @soix -- you just have to listen. That said, when I have paired pre and power amps a couple of times, (once Bryston, once Classé), the result was excellent.
Currently using an Anthem STR Preamp with Apollon monoblocks built around the PuriFi 1ET400A module. I like it as much as any pairing I’ve tried. Quiet, dynamic, and neutral.