I think the video quality of the name brands like Sony, Samsung and LG are all pretty good - so similar that I don't see much difference. So for me, the distinguishing characteristics are the controls and interfaces. I prefer simple and intuitive. The controls and user interfaces for many Asian products, like Japanese cars, just don't work for me, so I buy American because the controls, menus and panels make more sense to me.
That said, Sony TVs make the most sense to me. LG menus and controls are very confusing, and Samsung has some quirks that I would rather avoid. So my house is full of Sonys.