2013 Max Pro trashcan.
I’m going to have to upgrade my room heating with the Mac Studio, which has done great service, but even playing back YouTube videos at resolutions beyond 1920x1080 is a bit hit and miss. (It can be a bit temperamental on the Studio over HDMI but seems much better on displayport to thunderbolt.)
The Thunderbolt 2 to 3 converter from Apple seems to work ok with my nas and drives (and is less than half price when bought from Amazon, for some reason).
Lightroom seems to cause the 32Gb Studio to swap, for no obvious reason, which was never an issue with the trashcan.
Coding projects are probably the area where I have noticed the biggest speedup, however.
My overall impression is that the MacOS devs have been spending their time on revenue-generating apps and adding features, when they should probably have devoted more time to tuning WindowServer to make it less of a hog and making it easier to for developers to tune their apps to get the most out of the new architecture. At present there seems to be a good deal of throttling and underutilisation of the hardware.