Camera aspect ratio - Which do you use? [poll]

With the recent update to the Google Camera app, and when I played with the GS5 and Z2 I noticed that there's a huge plethora of resolution options as well as the aspect ratio options.

+Sylvain Le Bourhis had a good reason to go for the 16:9 ratio, even though it's lower resolution... casting.

As more and more we do less and less printing and more viewing on screens it makes more sense that it fills that screen.

But what format are you using?  Are you choosing more resolution or TV appropriate