Hi Justin,
I think most audio apps favoured CPU speed over number of cores. Maybe Logic is programmed to use more cores more efficiently, but raw CPU speed was always preferable in Digidesign/Avid land
The Mac Pro is looking more like the way to go. By the time you buy an external PCIe expander box the cost differential from iMac Pro to Mac Pro almost disappears. Plus you can put lots of extra drives inside the mac pro. Even good old 3.5inch spinning drives…
Peter