Aside from TeamViewer and Chrome Remote Desktop, does anyone use anything else? Any recommendations?

I want to be able to switch one of my screens from being part of my 5-monitor setup and this single screen would show me what's on the screen of another PC in another location in the house. Thanks!

From within the same network or from outside the network?

Both, but more essentially from outside my home network

Not sure about TeamViewer but people are saying they can control their desktop via Chrome Remote Desktop from their phone....

Try PC Anywhere? or if you can't get that anymore (unsupported after 2014), ISL online