Do Fellow back link is very beneficial for the SEO Because any one click on
this link then immediately open your website so this type of link increase traffic
...

According to me, Do follow as well as No follow links both have its own importance.
If Do follow links are beneficial for search engine points of view where as No follow links and also beneficial for traffic generation on site(because most of the high bookmarking & networking sites are no follow but they generate traffic on website.)

Mainly two types are backlinks in seo. The first one is do follow and the second one is no follow. In the seo point of view do follow links are very important.

You should build your back links from your theme related sites.Do follow links are added advantage. Build more back links from blog commenting, forum posting and article submission

My first reply to this question would be dofollow with high PR because those backlinks are only the backlinks from which you can get the high rank.

Article Submission
Blog Commenting
Forum Signatures
Social Bookmarking
Link Wheel

All links from reputable websites are always beneficial. The higher the PR the better link juice will be passed to your website.

Dofollow backlinks are worthy but as Olivia told us that proper balance is necessary between dofollow and nofollow, so its absolutely right that you have two maintain proper balance between dofollow and nofollow backlinks.