The highest display resolution of the UN78HU9000 is 4K Ultra HD. That's over four times the display resolution of the most frequently found HD type of Full HD. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
A 4K Ultra HD HD type is in fact the best display resolution amongst all TVs of this age and spec.
A Full HD HD type is the worst display resolution amongst similar types of TV.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.