Off the commercial off the shelf “smart” TVs available, I started by looking at the OSes available. Choices were Roku, webOS, Tizen, and Google TV. I immediately ruled out Roku because of their recent changes to terms&conditions. webOS is pretty much limited to LG TVs, and I had bad experiences with LG warranties, so I ruled that out. Tizen (Samsung) was out for similar reasons, so that left me with Google TV. It’s… OK. Doesn’t require Internet connection to work, and doesn’t nag me about it. And it came with a hardware switch to turn off the microphone. Not sure if that’s a brand thing (Hisense) or applicable to all Google TV devices, but was reassuring.
I have my SD docked into a 4k monitor most of the time, and I can tell you with certainty that some games will struggle at 4k on the SD. You can still use the 4k monitor for them, just play at a lower resolution.