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I actually think Twitter makes things faster. Digg can ban your site if you start spamming them with your sites. Happened to one of my sites back in 2007.
Actually Twitter and Digg both are useful where Digg is helpful for social bookmarking and twitter is actually a micro blog. But if I need to compare between them then I must say Digg helps us more to get target traffic to our site. Also sometimes it helps us a lot in quick caching a page in Google.
A lot has changed for the past one year whereby twitter has seen significant rise in popularity while digg seems to be lacking behind. My vote goes to twitter.