My parents are getting a new tv, and are asking for recommendation. I think all I can influence is the brand/model (not realistic to propose rpi and more complex systems). I instinctively avoid google/android and lean towards anything else open source, so probably LG WebOS… But I had bad luck searching for more detailed comparisons. Maybe you have experience or opinions?
You don’t have to get a smart tv at all. TVs do not need to be smart. If you search ‘business monitor’, you will find large quality displays such as used for corporate signage. The one issue is they often have only a few inputs, but that is easily addressed and worth it to avoid the completely unnecessary hassle of a TV too smart for your own good.
My two cents
Plug it into a HTPC, install Firefox and ublock Origin. Now you can watch YT without ads on a big screen in the living room. You’re welcome.