I have several Changhong 4K tvs and they are great, no stupid bells and buzzers but great pictures and sound. Very closely rated to mentioned TCL. The early ones were 60Hz enhanced sets and my newest is enhanced 120Hz. Changhong is all but gone now.
Stay away from 60Hz and 120HZ refresh rates and serious gamers swear to stay away from effective or enhanced 240Hz sets but it depends on your budget and how hard core you may be. My family room set is 240HZ enhanced and I very seldom see any lag. It's a big step up to true 240HZ sets.
Effective Refresh Rate is not a bad thing but you have to look at refresh rates and that's not easy.
My go to site is
http://www.rtings.com and avs forums.com
If your in the 2K range for a 55" the Costco deal below is worth looking into, if you want to spend 1K look at the top 2.I tossed in another one in the $1500 range. All three of the top units have 129 enhanced ratings with great refresh ratings
Take a look at these for starters:
Under 1K
https://www.samsung.com/us/televisio...n55mu8000fxza/
under1K
https://www.vizio.com/p55e1.html
Under $1.5 K
going on sale
https://www.costco.com/Vizio-65"-Class-(64.5"-Diag.)-4K-Ultra-HD-XLED-Pro-Home-Theater-Display.product.100370312.html
under2K on
black friday sale pricing Member only
https://www.costco.com/LG-55"-Class-(54.6"-Diag.)-4K-Ultra-HD-OLED-TV-.product.100343123.html