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interesting fact of the day: Thermal conductivity of all known materials spans ~ 5 orders of magnitude with a perfect vacuum being the least conductive and diamond being the most. (and diamond is insanely impressive at it compared to even most metals).
By comparison electrical conductivity spans 30 orders of magnitude, not counting super conductivity, between a vacuum and silver.
The reason superconductivity probably shouldn't be considered is because while it is truly a perfect conductor it does have a maximum capacity at which point it will break down and show normal conductivity properties again. So it doesn't actually behave like normal conductivity.
