Almost entirely head I would say. I'm no a particularly emotional person in terms of things that do not directly effect me, I will feel sorry for a person but I am unlikely to shed tears or be actually sad/angry/some other emotion over a story in the papers, a documentry etc. Animal cruelty doesn't make me weep but I think it's wrong, pictures of atrocities in other countries are sad, but I want action and don't understand how crying over it helps, I get angry sometimes but I don't have much of a temper. I don't think I could do the job I do (part of it is the administrative running of a child protection clinic and typing the reports generated,) if I was a particularly emotional person. I do believe I would avoid jobs which would make me particularly emotional, I couldn't be a doctor, nurse etc... anything that would make me directly involved with something sad as then I could feel emotionally involved and I believe that would make me bad at my job.
It's quite different if it's someone I know personally, family or friends, then I am emotionally involved. So I'm not an entirely head person, but I would say it's a good 80:20 divide in favour of head.