Try to buy a mini LED tv if you want better brightness and colors.. I think TCL 845 is the one. But quite expensive.
TCLs high end models like C7 and C8 series are generally fine.
However they’re Chinese so can have bugs here and there in their OS. I also have one of these and sometimes run into bugs specially when connecting external devices wirelessly.
Only buy Samsung or SONY if you can afford their high end models.
Do not go for budget models in these as they generally lack a lot of features.