knownothing: I am certainly no expert but google is your friend here. The argument is that R-Core, especially if isolated in a different chassis as it will be with an outboard linear power supply, will be quieter and perform better. The disadvantage, when compared with most torroids is size and weight, which again, is less problematic with an outboard as opposed to a built-in power supply.
As with all things audio, there is rarely universal agreement but as you say it is a pretty insignificant experiment to try out the Sengterbelle I linked to. It was a fair bit better than a slightly less expensive Talema torroidal based power supply that I also have here on my DAC and astonishingly better on my Wiim Pro+ as a streamer only, which certainly flies in the face of logic with the "bits are bits" crowd.
Here's a couple of links to discussions on other forums and I'm sure there are others. In any event to say I've been happy with the Sengterbelle's would be an understatement. If it doesn't work out for you, you're out $100. ;)
https://www.diyaudio.com/community/threads/toroid-and-r-core.228096/
John Curl also, for example, seems to have a preference for R-Core, so I figure that's probably not a bad thing?
