VNC (even the various 'Tight', 'Lite', 'Whatever' variants) is horribly slow -- usable in a pinch, but every UI/UX interaction is just delayed enough that nothing feels 'right'. Chrome Remote is much more responsive, it feels more like Windows Remote Desktop Protocol speeds, perfectly usable almost as if you were local.
Also it does initial connection handshaking so if you login to chrome from machine B and machine A is already set up for Chrome remote you can just connect there via a list of endpoints without having to know the external-facing IP address and/or setting up firewall tunneling.
Also it does initial connection handshaking so if you login to chrome from machine B and machine A is already set up for Chrome remote you can just connect there via a list of endpoints without having to know the external-facing IP address and/or setting up firewall tunneling.