Which is better?

Social bookmarking and directory submission both are very useful link building techniques of seo for getting backlinks for site.But i prefered social bookmarking more than directory submission.

Both techniques has its own advantages but if you want to get fast links then social bookmarking is better because directory submission takes more time to approve links and social bookmarking also helps to improve your page indexing ratio.
So as per my view social bookmarking is better compare to Directory Submission.

Both are good link building techniques... 

Personally for me, social bookmarking has better results and is more effective than directory submission. I really doubt that many people use directories - only bots.

Social bookmarking and directory submission are both off page activities.I think social bookmarking is more better than directory sites...

After penguin update these both techniques are going to big lose and many webmaster ignore directory ans social bookmarking.

Bookmarking is more effective because, this is the good way to drive traffic as well get backlinks.

bookmarking is more beneficial if done in good sites.

Social bookmarking is better because it don't take time to improve.

Both methods have their own benefits on your SEO campaign they can both drive traffic to your site and give your site a backlink. The problem with directory submission it take sometime before you can actually see the result since it takes time before the site your submitted gets approved if you did a free submission.

Social bookmarking is the best linkbuilding method.

I would prefer both. Social bookmarking help us to get more visitor to the website. It also helpful to get rank over search engine website. Directory submission gives same result.

social bookmarking is specifically for sharing interesting sites and articles while directory submission is just submitting your site to web directories.

Directory Submission is good one

According to me both are equally important. The main things are how you use this service.

both are important activities of off-pages seo, but i prefer social bookmarking.