Thanks, Ben!
Don't get me wrong, I am not complaining. From what I can tell with my limited experience with a desktop machine, the two Synchron Bösendorfer libraries are WAY better than the "other, less demanding" libraries, I was comparing them to.
The question now is: do they run perfectly on a 16GB MacBook Pro, if the samples are stored on a fast external SSD (provided the processor is powerful enough)? I need only the standard version of the libraries. For about 300€, one can get a 1TB Harddrive from Samsung with 2800 MB/s read speed (NVMe SSD with thunderbolt 3), would that be enough?
It is much easier/cheaper to get a 16GB MacBook Pro than a 32 GB one. The most expensive MBP, however, is the one that doesn't work properly.
Any hint is greatly appreciated since I cannot test the configuration without buying the harddrive...
Mat