In looking over the broad types of questions in BioSE, it looks like many fit into two categories. One asking practical lab advice from research, and more general questions on topics of interest to a more general public (though I have a feeling there's a bit of a selection bias if you were to look at who SE users are).
We obviously want to cite our answers as best we can, but I came up with my first dilemma last night after answering my second question. Should we cite a better article behind a pay wall, or opt for a less appropriate/rigorous/etc article that has open access. Ultimately I went for open access because I thought it was only moderately inferior to the article I wanted to cite. Obviously this is also going to be a case by case decision, but I was thinking we might try to set a precedence on preference.
I think I would be more inclined to cite an article behind a pay wall to a question about practical lab advice (on the assumption that the asker and future visitors to the question are likely to have a more broad journal access). On the flip side, I feel more inclined to cite open access articles on general questions because I would want the reader to actually be able to read the article if they were inclined (and I also look for more reviews or solid introductions).
Should we establish a policy on this? If there already is one I didn't find it. This touched on the subject, but didn't really address the question here.