I agree with you. Social bookmarking is more for publicity and to get traffic boosts. But I guess you have to use both. It's interesting to know what you guys think
SEO is better for targeted traffic and for converting traffic. But if you just want lots of traffic then Social Bookmarking may perform better, depending on your SEO skills.
Neither way works but it has to be legitimate.Use white hat SEO for long term relationship between you and Search engines.