Otto,
My experience has always been that notebooks with decent storage had slower drives than small towers. Also, notebooks were usually requiring a long down time for repairs where tower computers could be running again in minutes.
Newer notebooks using SSD technology perform faster but are also quite expensive.
Generally, I'm not sure a computer actually needs Server software. A Win 10 Pro machine might be quite sufficient.
Of course you are using RDC and I don't. How many workstations are using these servers concurrently ? Most of my clients have 5 to 20 workstations all drawing off the same database. Wouldn't that require an equal number of client installs on the server for RDC ? I'm not sure how you have your work configured so I'm still not clear how RDC can work well.
Tim