This is an interesting article in Petapixel:https://petapixel.com/2019/08/06/lightroom-shootout-6700-imac-pro-vs-5700-pc/
Basically it says buy a PC, get a faster computer and save a thousand bucks.
I bought nearly an identical setup, except the graphics card is slightly inferior, about a month ago. I sure notice an improvement in stitching over my previous computer. It is an MSI gaming machine and it was about $3,000 US. I really have no speed complaints about Lightroom or Photoshop now.
I assume that the SSD cards are M.2 which is what I bought. M.@ is the way to go.
Do any users have any views or experiences to share on this?