Facebook and Twitter both have differences the way people can act. So i think comparing them will not be a good idea. Facebook is great as social networking while twitter is the best microblog around the internet.
it's according to your purpose if it for work {seo-marketing-ads} of course digg & twitter or if it for networking definitely facebook
face book is the best because it is most popular and the i think it the biggest network as compare to other.
mm There is no point comparing Facebook and Twitter. Twitter is more of a Microblogging sevice than a social networking site!! And moreover, these have started to be more of a "Marketing" website. I hate when we have to "Like" an application before even viewing it!
It depends on your purpose, also the people you want to connect with. Thing is right to this person might not right to the others. To me: - Facebook is best to get connect with friends. Almost all of my friends use it. - Twitter is best for product promotion. Our customers use it.