I explicitly bought a LG TV with Web OS, because having some Android dev experience I don't want to put myself to Android TV.
Android TV is always catching up with Android versions, for several times its future seemed to follow the same footsteps as Brillo, Android Things, ADK, Tango, Sphere, Daydream, Sceneform, wearOS,....
And then there is the whole update story which is even more catastrophic than on phones.
So if I had to buy a smart TV, at least one from the vendor that owns the OS.