Which protocol is best suited to your needs depends on the availability of bandwidth, latency requirements, and the type of client OS you are using. Since you are using MS Windows, Xpra, created using the GTK / win32 proprietary toolkit, should be fairly fast, NX will use the local X server (which is slower, but you will benefit from optimizing the NX network ...).
There is a more detailed comparison of these protocols that may help you choose.
The tool in the link above makes it easy to start and pause sessions from remote computers, it is a graphical interface for Xpra, NX, VNC, etc., so you do not need to remember where the sessions are located or which port they are on. If you use only one session, always on the same machine, always on the same port, this may be redundant for your needs.
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