Buying a New TV

It looks like the bottom two are LED as opposed to OLED

Which depending on the lighting conditions of your room you may not even notice.

One legit difference is OLED will hold color better from off angles. So if its a wide room with U shaped couches that have some viewers not looking straight ahead thats a consideration

Whatever size you think you need, go one size bigger. A 32-inch flat screen looks like a small computer monitor from across the room.
At the same time, make sure you measure your space to make sure it fits.

My last couple of TVs have been TCLs from Best Buy. They have Roku built in, so it's easy to add channels and apps, and they're pretty cheap. Our 48-inch model cost about $400 a couple years ago. They're generally right on the sweet spot of a good TV at a good price if you triangulate the reviews. There might be better TVs that are a lot more expensive, and cheaper ones that suck, while TCLs are a solid 4 out of 5.
We also have a 40-inch Toshiba in the bedroom that we bought in about 2010 that is still going strong.

If you don't watch a ton of TV and aren't a video snob, there should be no reason to pay more than $600 or so for even a Sony or other top brand. Not sure I'd dip down to a HiSense, though. Those are on the low end of quality from what I recall.