Well for anchor text can I assume that this is links/navigation within your site ??
If so and you onlu have one link to consider, you would need to talk to yourself. By that I mean say out loud the single and plural options as part of a search phrase and back the one that sounds most natural and rolls off the tongue smoothest.
A choice made like this, is "Probably" going to be the derivative of the word most likely to be contained within your potential visitors search box on Google or wherever.
Once again assuming that we are talking about links and navigation within your site, you can always include a link here and there for the alternative derivative as a link embedded within the flowing and descriptive text. These embeded links would in all probability carry more weight because they are in context rather than just one link in your Navigation Structure.
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