Sorry that statement was when iMac Pro was their only contemporary machine which is when I built my current PC system which still outperforms the current iMac Pro by a large margin.
Most of my work is in OctaneRender
If I were to do a build today:
I'd buy Threadripper 24 core = £1245
For Apple this would be 24 Core Xeon from Apple = £6000, just for the processor on top of the base price of £5000
I'd buy RTX 3090 (OctaneBench score 670) £1399
For Apple Radeon Pro Vega II Duo (OctaneBench score 412) £5200, I could buy 3 3090's for that price...
It's just no contest, £3500 machine outperforming something over £16,000
What level of performance do you need and how does the latest Mac Pro with AfterBurner and whatnot fall short of it?