Well, the notion of A/B testing them, with recordings.... not going to happen, because an amp/speaker is at least 80% of your tone. If you notice, people will sell you lightweight titanium bridge parts because they sound better, and heavyweight steel and brass bridge parts because they sound better. Heavy Fender Tele bridge saddles are bad, but heavy Callaham Tele bridge plates are good...
If you want a classic tone, you could just buy the things that you know work, and then figure out how to use them. If you want something that sounds better than classic, more power to you. Every time I adjust action height on Fenderish bridge saddles, or try to turn the little wheels on a tune-o-matic, I'm impressed by how well string tension seems to hold the little bits together. You'll remember that Tone Pros had to STOP claiming that their bridges increases sustain by locking the parts down, for the simple reason that people unlocked them - and nothing happened? It hasn't stopped the Tone Pros users from continuing the claim - and Saddam still caused 9/11? I, personally have been kidnapped by little green men (who used to be gray until color movies came out....) :icon_scratch:
Given the total lack of evidence, I could make a completely plausible argument that making bridges out of a bunch of different little metal pieces of differing densities hurts tone & sustain - just like I could make a completely plausible argument that "vintage" guitars are only good between 5 and 15 years old, because all the classic rock recorded with '58 and '59 Les Pauls was recorded in between 1965 and 1975, Clapton's best Cream work (66-69) was recorded with a '64 ES-335 and an early 60's SG.... There hasn't been doodly-squat recorded with Gibsons more than 20 years old.
I can argue anything... :hello2: