Fuse or braker for dedicated lines?

Those who have tried this both ways report that fuses sound better than circuit breakers. Unfortunately those good old threads from Redkiwi are now gone from the forum archives. Ceramic-base fuses do sound much better to me than glass-base fuses; there really is a big difference in my rig (which is a bit *too* revealing) so these subtle changes are all readily apparent. The new plastic base fuses seem to be OK too, although I haven't done a critical listening comparison between them & the ceramics.
I had to go with the new plastic fuses only because I cannot find the ceramics anymore. If anyone has a source of ceramic 20 amp round "edison base" fuses or has some available for sale then by all means please drop me an email.
In any case, take the time to polish/burnish brightly all of the metal-contacting parts of the fuse & socket. Crocus cloth does very well at this job but an ink eraser will work OK too. Then use a good contact cleaner (Kontact) on all conducting surfaces prior to assembly, including the wire ends themselves. Polish up your AC cord prongs while you're at it; makes a difference believe it or not. Be sure to power off so you don't get electrocuted!

Terminal's opinion is simply that: no experience so he doesn't believe it. I use two Chang Lightspeeds with my dedicated line & this is real. Don't do it; it's your loss.

So we have 4 so far: Blake, Detlof, Redkiwi & myself who can attest to the positive attributes of appropriate fusing, yet the Doubting Thomases persist in disseminating misinformation & telling us what we can/cannot hear. Worldcup did not request opinions from those who don't even have a clue; he wants to know "what happens when" & those of us who have that experience have responded to help him. But we've heard this all before: all amps, all cables, all CD's, all (insert ___) sound the same. My take on this: all Doubting Thomases sound the same!
For those who do know but want to understand why, I cannot help you because I don't understand it myself; it makes little sense to me either. But I do know what I hear.
I'll conclude with a story about a blind test that I performed unknowingly & accidentally, if I even needed any proof this then is all that's required. Power went off at home for several hours one day when a storm was passing through, so I turned off all audio system power switches of course. I even went downstairs to pull the (then glass) fuse & decided to try "that ceramic fuse trick" that I had read about from Redkiwi. I installed that ceramic fuse & then promptly forgot all about it. I didn't power up the rig until the next day; turned everything on & was playing the tuner so I went outside to do yardwork for awhile. A few hours later I came back inside for a break & was sitting on the sofa wondering why the tuner sounded better than it had previously? The sound was richer & warmer, just more pleasant to listen to, but I didn't know why? I dismissed it to audio psychosis & returned to my tasks. But I kept hearing that nicer sound so that night I played some records & CD's, all sounding better than before. I didn't say anything to my wife about it, but the next day she was there quizzing me what had I done to the system & why did it sound better? I didn't know why, but we both agreed that something had changed & we liked it. It wasn't until several days later that I remembered the fuse change & attributed the improvements to that! Just to be sure I restored the glass fuse, but not for very long because that was the answer.

Albert YOU the man! For a long time I've been considering experimenting with exactly what you propose: ceramic 3AG internal fusing vs. the original factory glass envelopes. Now I'm really motivated --- where's my phillips screwdriver?

Still puzzling over this breaker vs. fuse issue & I'm just wondering...
Both devices have a buss input contact point & a load output contact point. However the breaker has an extra set of contacts internally (the switch part) that the fuse does not. Could it be the additional micro-arcing that occurs across the breakers's internal switch contact that makes them noisier?

Regarding line conditioning: I use Chang Lightspeeds which were in-circuit during the aforementioned "experiment". Whatever upline power changes occurred was not masked by these filters.

One other thing about breakers: the very worst kind to have for sourcing an audio rig is a ground fault type breaker - they're extremely noisy.