If your goal is to transfer all syuff from the old beast to the new PC i would suggest cloning the HDD...
Macrium Reflect and/or Easus to do can do this...
I figured a clone of the old hard drive would not work because the new PC motherboard would not work with a cloned OS. Won’t I have big MS activation issues?
I have checked out various 3rd party apps to transfer but have read and been advised here (I think) that these programs can be sketchy and unreliable.
Using Sync On and One Drive is as easy as it gets. Turn on new PC, login to my MS account and new PC will look just like my old rig.
I do have one question though. When I open File Explorer, I have a folder nested under My PC called HP_Pavilion C: I assume this folder contains system files associated with the old PC and does NOT get transferred to the new PC. Is that correct?