I currently like to use YouTube.com better than the YouTube app. While the app does look nicer, it doesn't allow me to browse through categories, like if I want to watch the top rated comedy videos of the week, I can do that on YouTube.com, plus the hd videos look better on the website.
Facebook is another one I can't decide on. While Facebook.com looks nice and displays more data on the screen at one time, I have to use a Facebook app if I want to update my profile picture.
Basically what I'm saying is.... Do you prefer apps or websites?
Personally I like websites.