My initial try was “Homo Praeferens”. What I mean by 'preferring man' is that we can always find the most favorite from a set of alternatives, which is the finding from my behavioral study. I think it could be a universal human nature and I want to express that by the Latin phrase.
I would suggest to use the verb "cernere", meaning "having the ability to distinguish (and operate a choice as a consequence)". Maybe something like Homo cernit (man decides), or Homo crevit (Here I use the perfect tense with a gnomic value, as in proverbs), that stands for "man has (always) choosen". Or, if you prefer, Homo semper crevit.
If you prefer instead to use the participle to create a paronomasia, then Homo cernens. Other interesting hues are: Homo diligens (choosing, and with a certain preference and even respect, love); Homo eligens (eligere means knowing how to choose, choosing with competence, and therefore nominate, elect, even in a figurative way); Homo optans (choosing, tending or aspiring to something).
Hope this helps!