Do you use Modern UI apps or Desktop apps more ?

Since I switched to Windows 8, I said to myself I'd probably never use the apps from the Modern UI, but as I've gone on, I use them more and more. One killer feature about them that I love is app snapping. Now this could be done kinda in Windows 7, but it was no where near as useful as in Windows 8. I tend to watch videos while browsing the web and just take a look at this picture here :

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via i48.tinypic.com

This is beautifully laid out. I really can watch that music video and type this post at the same time. This is much more functional than in Windows 7. But back to my point.

Do you use the new Modern UI apps more than the Desktop ? If so, why ? Also, if not, why ?