They have more capacity than DVDs. Not every, in fact not very many, BDs take advantage of this additional capacity, which is a shame and a waste of the format. Super high definition movies (4k) are only possible on BD, and it's cool to get additional extras with a normal HD movie, like the director's cut, deleted scenes, "making of" documentaries, etc. But if the content is the same as on DVD, you're just throwing money away.
BDs also have the capacity to connect to BD-Live, allowing online content to supplement what's on the disc. Although much touted when BDs first came out, I can count on the fingers of two hands how many BDs I have that actually utilize this option.
And I can count on the fingers of one foot (i.e. none) how many BD-Live extras are worth a half a crap.
http://www.imdb.com/title/tt0084855/
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