One is not better than the other, they're both quite useful for their own reasons. There are things one can post in here among the masses of virtual associates and strangers and get relevant advice on problems or just simply learn about new things, Facebook is good for keeping in touch with friends fromm the real world, sharing nonsense and so forth but one generally may feel restricted as to what they post for sake of the children of the friends on who's walls your posts may show etc. Which do you like more, Apples or Oranges?
I prefer apples. I also prefer pineapples to oranges, and I'd rather have a packet of crisps and a bar of chocolate then any of them. Beer > all of those.