1440p 120 Hz or 4k 60 Hz Monitor... Which Monitor Should I Get?

I have owned about half a dozen "gaming" monitors in my days. I can say without a doubt, 1440p 120 hz is what I would get. I use an AOC AGON AG322QC4 as my main monitor and it has every feature I want. My secondary monitor is a Samsung UH750, and it is a great monitor, but the immersion provided by 1440p along with the high refresh rate, really makes that my choice. 

Thanks guys. I've decided to go the 1440p route, higher refresh rates are too mind blowing to pass up lol.

I would've owned one now, but I couldn't resist getting the Animal Crossing Switch Console when I saw one for the normal price about a week ago. Scalpers man...

bread's done