Search Engine traffic source is very good. Yes as far as traffic source concern every traffic source is impotent.
Search engine traffic is a traffic that come from people who really need information in your site. They are potential users and the best one. Direct traffic is mean your site as known by users about your niche. Referring sites traffic can mean your promotion in other sites successfully or many sites recognize that the content in your blog can be used as a reference.
Generally the best source of traffic are the search engines, other online sites with high level of traffic, article directories etc. But what is more important for you is to get some targeted traffic that is either making you money on your site/blog or creating some income or revenue for you, on your site/blog. You may start with using the general best source of traffic but by tracking your online promotional activities, sales and revenue, you will know where your (most valuable) traffic that buys is coming from, it could be from any targeted ad medium/method you may be using for your promotions, and not just the search engines or Google. Each site/blog's experience and results will vary.
The best source of traffics are social networking sites. The sites like Facebook, Twitter and Google+ have millions of users where you can interact directly and can divert that relevant traffic towards your site.
For new websites search engine traffic is best. But when your website have established a reputation you need decent direct traffic. Else you will have high bouce rate which is bad for your website.
Social media websites are providing the valuable traffic. Then come seo and linkbuilding for providing important backlinks.
The content quality should have been good to drive direct traffic to the site and other traffic is good as they count as the backlinks to your site..They are most probably a result of off-page optimization..
Business is the only purpose for a man looking for seo. So whatever be the source business is the aim.
search engine traffic always best because if you have search engine traffic google and all other companies will trust on you and reffering site traffic is also on good so the table is 1. search engine, 2. reffering, 3. direct.
Search Engine traffic is best among them. It has the maximum conversion rates as compared to any other.