Well, I guess it comes down to your personal choice. I currently own a 50KU6092 and I am more than happy with it. The main differences between those two TV's that you listed are the series - J vs K, in alphabetical order, the K one would be newer but you have to consider that the model number it's a little bit higher on the J one, so it might have some small advantages over the other one, but after a little bit of research, I think they are basically the same TV. If you're on a tighter budget or just want to save some money, get the one with a lower price.