R.Cordell did reach a conclusion.
On a fixed budget, I would opt for better rectifiers in the conventional arrangement
By conventional, he means Centre Tapped with one Bridge Rectifier.
That's the way I usually build my PSU. But I have done it with dual secondary and dual rectifiers, series connected at the outputs. with the equipment I have I cannot measure any difference in performance, except the lower voltage and the higher heat load that comes with the dual rectifiers.
I suspect that more sensitive measuring equipment and techniques may be able to discern an operational performance difference. I suspect that would show as reduced harmonics of the mains frequency infiltrating the audio circuits for the dual rectifier.
But I ask myself the question, if the audio artefacts of the centre tapped are @ <0.05mVac of Hum + Noise at the output of the amplifier, will reduced harmonics give any audible improvement in performance?
I have seen many FFT of amplifiers posted on this Forum. I cannot recall a test report that specifically looked for, or at, the difference in performance of the dual vs the single rectifier.
Maybe we could persuade those that have the knowledge and the equipment to do some comparison tests for us and settle the argument.