Picture quality is OLED, by far. The downside is that it is susceptible to burn-in. Some extended warranties cover burn-in, so it might be worth it in that case.
Don't worry about internet features. You can block the TV from accessing the internet in many creative ways.
Put the TV in a large faraday cage .
Just don't give it the WiFi password. If it insists, just block it from accessing anything at the router level.
Get a cheap wifi router and have it connect to the SSId, but never connect the router to the Internet. It is a tarpit. A better way to go is to connect the wired connection to a switch that can clone the port. Use wireshark to monitor packet headers and block the outbound addresses it is trying to connect to on the firewall.
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