Depends on what you mean by accurate.
If you get your programming material from Britain, quite a lot of that is 14:9 - if we're talking about intended (original) aspect ratios of movies those are as follows - 1.85:1 translates to 16.65:9 and 2.39:1 is the same as 21.51:9.
ATSC-HDTV programming is basically a straight 16:9 - and that's considered the right compromise format. (Many people think that movies are shot 16:9 but that's rarely true. People still hate letterbox and their demands for a jammed-full screen are screwing it for the rest of us that want to see the intended/original aspect ratio.)
So - take your pick. 16:9 is the popular format, so it's not incorrect to say the X is the one with the truer aspect ratio.
For a TV.
I use my Evo in portrait mode quite a bit and wouldn't prefer a skinnier format - I like eBooks.
http://en.wikipedia.org/wiki/Aspect_ratio_(image)