I'm waiting for some additional comparisons, but at first glance, the problem I have with ProRender is that while it gains features to be production ready, it doesn't yet provide the significant speed we can expect from a GPU renderer at least having a very high-end configuration with multiple expensive GPU. From what I already saw, all other third party renderers are not just two but multiple times faster to achieve the same result, and with OpenCL officially deprecated in MacOS it doesn't seem to be the best bet for MAXON.