Personally this is a hard choice for me as I use Facebook for more video based content and Twitter for more promotional based content. If it came to me personally I would say Facebook, but I often use Twitter for the site.
I'm a bigger fan of Twitter. I stopped using Facebook a couple years ago because I had more personal issues with people on it and how it worked. I can't really describe how I feel about it anymore, but I've recently learned there's a business side you can use to control pages, so I'm starting to use that a bit. The reach you can get on Facebook and the analytics are pretty good, I'll admit... But I still use Twitter mostly for social and work things alike.
Facebook seems to be what most people have been using. Twitter seems to be best for famous people as I said in a similar thread on my site. But Twitter could never be as popular as facebook though it's not terrible for reaching out to people on.
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