My experience with samsung has been below par and at most you get only one year warranty. Same case with Sony Panasonic etc.
On the contrary, the experiences with TCL have been better. A friend using 65” 4k tv for two year without any issues. I myself have bought TCL 65” C725 and havent come across any issues so far. My biggest and only reason to go with it was 3 years extended warranty. Sony and samsung 4Ks had better quality, no doubt but it wasn't a deal breaker for me.
I, personally, will never spend 200/300k or more on a tv which which comes with one year warranty only.