I've been fairly happy with the Google/Android TV versions, but the primary feature I bought them for was the ability to pair bluetooth headphones with them. Bluetooth seems to be hard to get, but all Google TVs support them.
The lower end TVs can barely do the Google TV features, often being flaky. The higher end ones tend to implement the features much better, though not perfectly. My TLC 6xxx series is much less flaky than the 5xxx series, but I do sometimes have to reboot it at the beginning of every watching session, depending on the app.
Can’t you just pair your Bluetooth headphones to the device that is providing the video stream? That is the source, the TV should just be the output device.
The lower end TVs can barely do the Google TV features, often being flaky. The higher end ones tend to implement the features much better, though not perfectly. My TLC 6xxx series is much less flaky than the 5xxx series, but I do sometimes have to reboot it at the beginning of every watching session, depending on the app.