There are probably benefits to both ring and star - the advantage of a ring main is you half the impedance for the same gauge of wire, the audible benefits of which, in my experience, are better bass and improved dynamics.
Mine is essentially both ring and star, since I have the ring main to one unswitched socket, then an 8-way Russ Andrews Mains Block (which I believe is star wired/earthed inside and uses very heavy gauge, low impedance cable). Each individual component plugs into the block. The block has filtering too, which mitigates component separation to a degree. I plug in network switches, and the TV, to a different socket on a different ring anyway...
When I tried all these things back in the day, the benefits of moving from a switched to un-switched MK socket were significant, as was the step up to using schucko sockets, simply because you then lose the UK plug fuse, again, better bass, improved dynamics, smoother. Similar improvements with the dedicated ring, along with better isolation from the rest of the house mains, I suppose.
I also use a dedicated earth, with a very low impedance cable.
The great thing with these is they're easy to try and relatively cheap too, just make sure you have someone electrically competent to do, or check, your work for anything you're not happy doing yourself
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