Anyone have any good reasons as to why I should use PCAnywhere instead of xp's remote desktop (RD) for remote access? I'm going to change RD's default listening port and enable encryption.Thanks.

All that's needed for Remote Desktop to work is a subscription, an iDrive agent downloaded on a device, and a connection to the service.

If you want to enable Remote Desktop Access with xrdp on Raspberry Pi to connect to it using any device of your choice, see this tutorial.