I had looked at some z-wave solutions. And I did take a close look at the Nano Switch. In the past, when I've looked, the z-wave stuff required a USB dongle on my pi and I see that this uses a dongle as well. Honestly, unless I get a hub, I don't have any available USB ports on my pi. I guess, other than price and open USB ports, it would be a comparison between CPU load on google home versus something that uses Z-Wave. It also seems that the Fibaro link is for a euro socket. Does it have a US version?
Honestly, I was thinking about the possibility of a RF hub simply because running pilight on my pi is a surprisingly heavy CPU load even with my receiver disabled. I wonder if there's a smart RF outlet that can detect power usage changes... then I could solve 2 problems in one and get a faster pi in the process...