Sure, all 4K TVs are pretty flat, but there are some major points of differentiation. Different brands will hype up the degree of flatness, or the thinness of the bezels around the screen, but honestly, there are more important things. You need to look at how much light these things can put out, and almost as importantly, how dark they can get. You want to make sure you get the right size for your home setup, and for the content you like the most. And you want them to be as easy to use as possible, which technology can help with a lot. Here are a few other things to consider.