It's not fair to say VNC/RDP, as if they're similar, when RDP is really more like X than it is like VNC.
It will ship rendered bitmaps over the wire if necessary, but it should only be necessary in the case that the client has done its own rendering into a bitmap, where X would need to do the same.
The experience of using RDP is vastly better than VNC in pretty much all cases, and at least somewhat better than X in the grand majority of cases.
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