Is the difference higher payouts? What is the difference between neverblueads and azoogle? Is it payouts or just different campaigns?
Payouts, every network is going to have exclusive campaigns, neverblue offers payment via paypal, and my AM with neverblue is awsome That being said you should never limit yourself to 1 network....join a few and spread your $$ around, never have all your eggs in 1 basket.
It depends what type of affiliate marketing you are doing. MoreNiche is a fantastic and very popular affiliate program that offers quality sites and products to promote. I like this site over other affiliate sites because it's completely free to join, and they give free tools, plr articles, ebooks, site templates, and many other promotional resources to all of their members. They have something for every website or blog, and the payouts are up to $300! I would definately recommend them to anyone looking for a highpaying and quality affiliate site! You can go to MoreNiche.com or there's a link in my signature. Good luck and feel free to ask me any questions you may have about affiliate marketing or web development. I'm also a freelance graphics designer