You're going about this process all wrong...
The question should be: what's the best site for me to share my article on.
If the options presented offer only the benefit of backlinks then that becomes your criteria but that's not an ideal place to be.
A good article and a good site does far more than give you a little link for a search engine to read, it gives you actual exposure and the chance to be seen within your category to build up more of your reputation and lead to more articles. Remember, the goal of search is to get traffic but search is not the only source of traffic. I'd gladly give up a link follow, no follow, or any other flavor for inclusion on a site people regularly read.