I own currently the Sony 55X900E for my bedroom, LG 65SJ8500 for my living room, For samsung my only experience was that it was my very first TV buy in 2010 or was it 2011? - 40D5000. Still works by the way, but gave it away last year. So the samsung tv was alive for 7-8 years and might still be alive now.
When i bought both sony and lg last year, i was decided not to buy an OLED set. So i bought Sony because of the excellent picture quality. Outperforms my LG tv by a long shot. What I like about LG is that the magic remote / cursor makes it convenient for me to browse youtube and typing in stuff in the search bar. For Sony, the Android TV os is ok, hate the remote though. The OS is fine, works well but typing is a pain with the remote.
I bought the Sony tv for my bedroom because it was the best picture quality my budget could buy that was not OLED. Samsung was close with the QLED but I felt was overpriced for me. 55 inch was also the maximum size i can put in my bedroom.
So my point is, Both OS are fine. Almost one year for me of using both. If i could marry Sony's picture quality with the remote of LG then that would be great.
Reliability wise, all my tv's are plugged into AVR's. Never had a tv die on me prematurely, fingers crossed. At my parent's house, lightning struck a nearby pole and fried the LG tv since the electricity came through the cable wire. fried the Skycable Digibox but the LG was damaged and LG just replaced an IC thing for free since it was under warranty. Parents are happy with LG's quick and painless servicing.
Point is, and this post is OT here. Buy the best deal you can have for your money. If the best deal for you is TCL then kudos. But I wouldn't knock Sony for the "premium" that one is paying for since that's how i feel about the QLED series of Samsung. Better value for me is my Sony set with FALD and excellent picture quality.
I only mainly use both tvs for Netflix and Youtube on a 50mbps connection. 4k HDR really pops and picture quality of the SONY tv stands out. So it was a good deal for me to buy Sony. Good deal also with LG for the 65 tv i bought for the SJ series.
So go buy what is the best deal for you. RTINGS and calibration helps. Before buying just take your time on a narrowed set list of tv's you'd like to buy and decide from there.