<p>I am about to purchase a TronXY X3 or P802; but, my PC is running Windows 10.</p>

<p>The spec sheet for the printers does not list anything above Windows 7.
Is anyone using either of these printers with Windows 10?</p>

Since the printer supports using an SD card, you don't
need
to connect it directly to a PC. Serial over USB has been broken in the past in various Win10 builds, I've not tried it recently and I've not tried connecting my A8 to my PC recently either.
If you need to use USB, and can't make it work with Windows, there is always the option of using a Raspberry Pi single-board computer (which you can then connect to by VNC from your PC). Depending on the software you want to use, this might resolve any remaining issues you have.