I've been thinking about this for a while, and I just strongly believe that peanut M&Ms are a better choice than plain M&Ms. The anomalous M in the peanut variety will be a nutless one, which is still pleasant. However, if you start out noshing on a plain, but get a strange M, that means something unusual has been included, rather than excluded. And that, my friend, melts in your mouth and not in your hands.