Sonar will handle Intel multi cores very well. Some of this is dependent on how threading is implemented.
In Platinum we have a visual representation of the cores and you can see which cores are pushed the hardest. One recently added feature is plug in load balancing. This is yet another way to work to more evenly distribute the entire load of a complex mix. SPLAT is made to take advantage of multicore.
In my mixes, the load is spread fairly evenly with the entire system seldom breaking a sweat on any of my cores.
The way Intel .vs AMD systems use the cores works a little differently. While the specs might look better for multi thread work in Ryzen, it all depends on how the cores are being used through software. In some ways this is like an apples .vs oranges comparison.
The two are competitive in trying to do similar things, yet there are patents, so one needs to find another way to do the same things.These different approaches can yield different results.
I can only speak from experience with Intel. I've never seem any problems with Sonar Platinum having any difficulty whatsoever in using all of the cores in my 5820K.
Am I making any sense to you here?