Anyone have any experience with these TVs (particularly on Xbox and PC)???

I am thinking about picking up one of the following 4k TVs this week:

Vizio P Series 65 Inch

Samsung Q6 55 Inch

Unfortunately the LG OLED TVs are still out of the question. They are just way out of my price range right now. SOoooo, out of the options above, anyone have any experience gaming on these TVs? Seems like the VIzio P Series is a really good TV, but the Freesync tech in the Samsung TVs is also quite enticing.

I'd also be curious to know if anyone has used their PCs on either of these TVs and if so, what the quality was like. My wife and I use a PC in our living room for Netflix, gaming, etc. I know 4k TVs and PCs can get a bit more complicated (something about 4:4:4 to reduce blurriness but that makes colors faded??? I think...?)

Overall I feel like TVs got way more complicated in the last 5 years or so and I'm really not sure which features I should or should not care about other than input lag, refresh rate, and the visual eye pass. What the hell happened?

Edit: it would be an Xbox one x and gtx 1080 hooked up to it by the way...