All sources has its own importance like: Search Engines traffic shows your popularity on search engines. Direct traffic shows your brand popularity Referring Sites traffic shows your link popularity on web.
Search engine is the best source of traffic for me. Google to be exact. It serves as the bridge to my website. It simply works more than facebook and Im glad that my SEO tactics work.
Search engine traffic, but always build a list with the traffic you recieve, its the best method especially as your SE traffic can easily be cut off at any time with a few simple changes to the Algorithm.
search engine traffic and from social media sites like twitter mainly and fb, twitter is better cause people that are on fb sometimes don't like your website or visit it or even share it cause they're afraid of opinion of their family and friends.
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Most definitely Search Engine Traffic. Referring Sites can help and Direct Traffic can be easily manipulated.