I am still waiting to get my hands on a proper 4k tv for myself. Like we do have a Samsung one but I don't play games on it.
I am trying to get one that is fap worthy for both PCs and consoles. Most likely I will wait until next year as some cool 4k monitors are supposed to come out.
Unless you have big bucks in 2020 you can only have two of resolution, size, colour quality and refresh rate.
I don't want to make any grand claims about the best way to game. But the prettiest way is with size and colour - not resolution and refresh rate. As soon as Sony or LG get an affordable 4k TV to 120Hz.. that's when i'll go 4k.