I am doing photo and video editing as well as some 3d (Blender) and will be updating from a 2010 Mac Pro.
In the Mac Pro I use a dedicated 1TB SATA SSD as a scratch disk for caches and such. I was taught that it's always best to keep a scratch disk that is physically separate from the system...
Regarding a classic Mac Pro 5.1 for media work:
If you had
1. a faster SSD (NVMe) that connects via PCIe slot
and
2. a slower SSD in one of the four harddisc drive bays
and
3. an even slower HDD in one of the four harddisc drive bays,
which of those 3 would you use for
A. Operating...