I think most people (myself included) feel that context here is important and deeply philosophical. If Reason indeed reigns supreme, who or what are Its subjects? Is it Love, Emotions, Experience, the Senses, etc.? But then what would reigning supreme mean? That Reason is (say) more aesthetically compelling than Love? But what would
that mean? You get the idea... this kind of question is intrinsically rather vague, though not necessarily worthless (at least to me). It's a topic more amenable to long essays and treatises than to polls. (Still, see
http://philpapers.org/surveys/results.pl .)
If your intention was, however, to restrict your question to mere humans, it should have read something like, "Are human beings eminently rational?" But I doubt that was your intention.