Screen size, and viewing distance determine resolution needed.
Budget determines what you should be looking at.
9 times out of 10 1080p is perfectly fine for people. You likely have no 4K content to show, you likely have no need for 4K content, you likely don't have a 4K capable A/V receiver, you likely are using the speakers in the TV, which are weak.
There are better things to spend money on then a 4K TV in many systems. But, some of the absolute highest quality TVs happen to also have 4K resolution, so if you want the best, it will end up being 4K.
IMO, Samsung makes the best looking displays which aren't OLED right now. The LG OLED displays are the best looking on the market, but come at a premium.
So, after all is said and done, budget really matters as well.