Logic dictates that a dual mono build (or mono blocks) will offer improved performance / sound quality vs a traditional stereo amp sharing one PS. Has anyone any experience of actually comparing the same amp but built with these different configurations? I’m curious, all aspects being equal (eg total VA rating of the transformer(s)), how much difference does it make in practice?
Once you identify the issues within a power supply and design with them in mind, it becomes less necessary to think in these terms. You may still be interested in branching the supply for various reasons.
Dual mono or at least separate reservoir capacitor banks per channel will often improve the soundstage / stereo image of an amplifier.