Out of them 2, digg brings the most I find, even if you don't get on the front page. I must admit though, the second post options are the best to go for if you can't get on the homepage of digg.
so i complete the list Digg Del.icio.us Reddit Stumbleupon ... ... if there are more recommendable add them
Del.icio.us, If You Don’t Use Del.icio.us, You Will Now; http://www.techcrunch.com/2007/04/05/if-you-dont-use-delicious-you-will-now/
Stumbleupon is the only one that brings me significant traffic. A general picture isn't possible though - which one fits your site best depends on the niche it is in.
See, you can't get popular. Because you have named it as EnDigg and if you get popular, Digg will shut you down. The word "digg" is their regd. trademark. coming to the topic, i get good traffic from Digg and Stumbleupon
Alot of sites want to grow big online, but the first mistake some sites do is to name their site similar to their main competitors name. That is a trademark infringement and can get you into trouble. Anway, back onto the subject. I have never really got any traffic from del.ic.....