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Emotion motivates human behavior but logic regulates it. You can't really choose one over the other, because both are vital components in the fight for survival. We evolved and been conditioned into having certain emotional responses to certain situations, in order to help us survive and consequently thrive, and that in itself is logic. A primary example of this is in parenting. Baby features for eg elicit caregiving, and provoke emotional reactions caregivers. Bio(logic)ally they look the way they do, so people will look after then. (They don't come out looking like grown men/women for a reason.) Also their social releasers (crying, smiling etc) are logical as it allows for them to communicate their needs. Logic and emotion work in conjunction within one another, so you can't unequivocally give one precedence over the other. Both characteristics don't serve a particularly useful function on their own.