This is the world I live in, as I help design and sell cameras and monitors or the broadcast world.
Let's start at 4K . doesn't mean diddly squat unless you have a blue ray or stream hi-res video from some you tube source. Without wading in too deep. If you're on an antenna you will never get a 4K"signal" unless some rogue entity decides to invest billions to broadcast 4K
OK back to square one. I haven't cut cord, and have
Amazon Fire TV's on my patio and bedroom.
Luckily when dish receiver turns on it automatically switches the input of those
TV's to straight from the Dish box. Going back to Roku (or what have you) they depend highly on a robust WiFI signal, hoping you have hearty wifi and will "stream" theirs or someone's programming. (sling/hulu/you tube.)
I pay too much for my dish programming and get chastised by "non-broadcast" types hat tell me.. "you can get all that crap from the web.
Sorry, had to go back and re-read your post.
As fart as the TV goes, all of those unbelieveably low priced TV's at walmart are reverse engineered from TV's from the good guys (Samsung/Sony)
Typically you get what you pay for. My eye can see the difference in a picture on let's say a TCL or whatever brand and my 75"Samsung. These are TV's made by the lowest bidder for low sales price. when you get it and set it up you, and many others will be so excited to have a BFP (bif F'n picture you will never notice things like true black and contrast.
I've probably already lost most folks by now.
It kinda goes back to the days where "they" told you that you need a special HD antenna. The antennas from home depot will receive whatever signal reaches your house. I'm fortunate to live smack dab in the middle of the Miami/Palm beach broadcast area. I can hit the program channels button and receive 54 channels. They are all variations of the big four networks, ( no CNN/Espn or the like.
Let circle back. I only buy TV's somewhere I can return it to physically. Of course most sales folks at best buy were selling garden tools at Lowes last week, and aren't trained to help customers, just close sales.
I'd set a budget and buy what looks good to me. most store TV's only come with 90 day warranties.
My eye is trained enough to see the picture difference between OTA (over the air/antenna) and the compressed signal that cable/satellite gives you. If I'm going full bubba nd Watching NASCAR, I will switch to my antenna (still have one mounted on the chimbley)
I'd be happy to discuss further offline as to not pollute this thread.
Just remember you get what you pay for. Wal-mart recently bought vizio who previously made "OK" TV's.
TV's today are made to be disposable appliances.
You're most likely not going to have it for 10 years like you used to with your old Sony.
Message me if you really wan to learn more or hear more gobble-dy gook.
or ask here.
John