Without much fuss, Apple yesterday extended the GPU options for the new 16-inch Mac Pro Pro - and added a rather potent AMD option. The now available mobile AMD Radeon Pro 5600M will be available exclusively for Apple computers until further notice and differs from all other available models by an interesting detail. It has 8GB of HBM2 memory, which was widely used by AMD in the previous Vega generation, but wasn't used at all in the new mobile 5X00 series.
Compared to the previous options, this increases the GPU memory throughput, which is important for video editing, to approx. 400 GB/s, while the AMD RX 5600M with GDDR6 memory, which is also available for PC laptops and is similar, "only" reaches approx. 300 GB/s. For mobile Apple users, this mobile GPU option should therefore be quite potent under Final Cut Pro or Resolve, but also costs almost 1,000 Euros as a BTO surcharge in the configuration.
One gets complete PC laptops with just as fast DDR6 memory connection (over a 256 BIt interface) currently completely starting from 1.500 euro with a 
mobile 8GB RTX 2070 GPU of Nvidia. Which of course compares pears to apples, but should still perform well above a Radeon Pro 5600M in terms of GPU performance under Resolve.
;)