i am always on cinema or cinema home mode. Vivid mode is very eye candy to my eyes, but i felt tiring after watching it for sometimes. is like feeding u sweets until u sugar rush over rush lol.

Best  use one accuracy d65  picture  mode for all content.  So I only use movie mode which disable all picture enhance mode, sharpness to 0,  motion processing off,  warm 2 color space for all my ps4 ,switch  gaming & movie, youtube  content.

i am always on cinema or cinema home mode. Vivid mode is very eye candy to my eyes, but i felt tiring after watching it for sometimes. is like feeding u sweets until u sugar rush over rush lol.

This is because Samsung TV  dynamic mode is over-saturate.  IF  you ask them to switch to  movie mode.  You may feel samsung tv color  under saturated. Samsung need to heavy calibrated to get correct color to please your eye. So oled is always  better choice for picture quality to please our eye, even in over-saturate vivid mode.

If Android TV OS ( true Google certified ), 99% confirmed have Chromecast build in.
Ya, I was surprise my Samsung ( non Android TV OS ) can do that for Youtube    From Android or Windows also can cast.

That is not a problem exclusive to Samsung's TV . All TV brands have a mega over-saturated Dynamic /Vivid mode .
These "QLED" has a weakness  of not able to fully tame its massive colors spectrum but undersaturated is not one of them .
Samsung's Flagship TVs  has a movie mode that is fairly accurate , far more than a certain ABC brands I won't be naming here .
What is not accurate is their PQ adherence  . Since PQ is absolute , it is hard to calibrate your TV to exact same level as PQ chart . 

The wRGB OLED TV is losing color saturation at brighter colors is not exactly a secret .
The problem lies with sites like rtings when people tend to throw their numbers around like swinging a sword , often end up hurting themself more than not .
You see the DCI coverage numbers from rtings on OLED TV - 98 % ! 
And then you look at the Quantum Dots LCD , only 95% ? Woohoo OLED Wins , amirite ?

Does that DCI chart from rting tell you the whole story ? Not at all , not even close .
Those numbers are 2D measurement but the color spectrum is a 3D monster . They are not representative of how your TV will perform .
If the 2D color coverage is not that important , why not just focus on the MDC test ? Because it is very difficult to measure color volume . 

Typically we only take 8 measurement or so for the Color Gamut . For Color Volume we have to do hundreds of them.
(We now have MDC from Dolby Lab that can measure color saturation up to 10000 cd/m2 on Rec.2100 )

In a MDC test of 1000 cd/m2 ,  we can use a very loose number to tell the difference.

A wRGB OLED can show roughly 300 ~ 400 millions colors .
A Quantum Dots TV with 2000 cd/m2 such as those Vizio Quantum and Q95T can do 800 millions +, possibly way more due to limited size samples .

[Note :  this is assuming all test is done on 10% window where LCD is typically brighter at 15-25 % and OLED is brightest at 3% , all pixels have 10 bit color component .
Barring these numbers , there is a lot more color science involved behind the scene , I am not explaining that on a forum .)
This indicate a TV with high brightness isn't just a screen with dazzling lights , they also have a whole new world of color saturation range that is wider than wRGB OLED .

Note : To those who complain about 2000 cd/m2 being too bright , remember they are talking about an additive color system . The brightest white of 2000 nits , does not mean TV is going to show you 2000 nits of colors  .
Brightest peak of white consist of 3 other separate primary colors , namely Red , Green and Blue . As a result , a pure saturated blue may just end up to be around 200 nits on a display of 2000 nits peak . 
Now imagine your OLED TV may be struggling to reproduce 200 nits of 100% saturated blue .

I am sure a lot of the OLED elitist ( like I once was ) will tell you perfect black makes everything .
True that the perfect black will leverage some of the shortcoming but what about scenes with a lot of bright area ?

On high APL ( > 70% ) scenes , where you will find a noticeable difference in movies that has such as the fairly recent Maleficent 2 , where it looks quite a bit paler on a wRGB OLED .
Or you can try playing the same movie on your Samsung S20 or Iphone , you just cannot get the same level of vibrancy on OLED TV .
OLED TVs ( the panels manufactured by LGD specifically ) has hit the roadbloack in terms of Picture Quality for several years now . The LCDs , however are improving to close the gap every year .

In the past few years , they have introduced wide angles optical filters ( not perfect but an innovation regardless ) , achieve an even higher level of sustainable brightness , dual layer LCD with light compensation technique ( not the same as those you found on mid-range Samsung TV ) , a more advanced algorithm of Local Dimming that does not need to rely on numbers of dimming zones , VRR ( they have it before the OLEDs ) ...

I have always adore the self emissive screens , from good old plasma to OLEDs .

As I see it now , there is a spot for the OLEDs and a spot for the Quantum LCDs .

OLED TV is no doubt a masterpiece for SDR stuff . But its HDR performance could use more improvement , including the less than ideal dark gray performance .
This give us a reason to wait for LG to announce its top emission transition every year , and the new Quantum Blue OLEDs from Samsung .

Actually for the moment, not Android OS TV can at least received cast of YouTube and Netflix from your phone over.
This is working for my LG C9 using webOS and also Panasonic EX600K using FireFox TV OS (My Home Screen).

What about the Panasonic GZ1000?

All Panasonic TV run Firefox TV OS (My Home Screen) except otherwise mentioned as Android TV. So far GX650K is the only android TV release by Panasonic if not wrong.

Is there a way to install VPN on any of these smart TV? For watching Netflix USA etc.

Or how do you people do it?

I didn't use that,  local Netflix I already can't finish watch. For me it is unnecessary.

I read most people set at router.

There are 5000 titles on Netflix USA vs 1000 here. More choices.

Putting VPN on routers slow speed down drastically by 5x for the whole house. So not practical.

There are 5000 titles on Netflix USA vs 1000 here. More choices.

Putting VPN on routers slow speed down drastically by 5x for the whole house. So not practical.

Use routers capable of policy-based routing to route your TV traffic over VPN while letting other users/devices connect to the Internet directly, or via another VPN.

I used that to connect my infamous Turkey Netflix account to the USA servers on my nvidia Shield while the the rest of the house connects directly to the Internet.

Does that means:
1. You can install VPN in the Nvidia Shield?
2. You no longer using the TV's manufacturer's remote and uses NS?

Thanks

Sifu

Using Sony x70f 65 Kong last week

Considering

65inch
Sony x8000g
Samsung ru7400
Samsung ru8000
Pana X740
Sony X8500G
My budget is around the first 2 in the list but others can justify the benefit, I don't mind to add on.

Which is the best recommendation? Maybe you can arrange best on top follow by others

Kong? What happened & how old is the unit?