Currently I have a 65 inch Sony XBR-65X800B TV that just runs off built in TV speakers. I only use it for PS4 Pro, Switch, and xbox one (soon gonna be a One X). I am looking into getting a new TV in the near future, and also considering getting an actual sound system as well. I do not know alot about TV's, except that I want to stick with 65 inch, 4k, and get HDR (I do not think the TV I have now has HDR). So my questions are:

What would be 3 TV models that would give me the best picture quality? I have heard OLED is the new hotness, but then a friend told me that OLEDs actually do very badly when sunlight shines on them, like coming in through a window. He said it gives you a lot of glare. Is Samsung and Sony still the top dogs for TV's or has another brand stepped in? I am willing to put in $2500 for a TV.

WHat kind of sound system would be a good one? I see sound bars with subs all over the place now, but also I see speaker hooked to receivers. Which gives the better sound? And is there even that big of difference between the quality of sound from going with a sound bar vs a receiver plus speakers?

O am no good to you on the TV question but the audio is dependent on your budget and your space. If you have the space going with separates is going to give you better sound. It is more complicated to set up with more cables and such. It will also give you more inputs to work with if you add more sources.

Either choice is going to give you better sound than the TV speakers. The built in speakers are just too small and they are likely pointing in the wrong direction to make space for the screen while keeping the entire profile small.

You are probably already at the max for what sound bars can handle with regards to inputs. You also want to make sure the sound system can pass 4K through.

Also consider what you watch. Streaming services tend to have compressed audio compared to blu-ray and 4K DVD which will make better use of sound systems.

Start with your budget though and do not underestimate how much improving your sound will improve your gaming and viewing.

I would say go with a receiver and speakers if you have the money to do so. Especially if the receiver can handle some of the newer audio formats