If all other things are pretty much equal, I would consider these two things:
1) If you aren't already including it in "how happy you are with either job", consider how much you have to put up with other peoples crap. Since you say that you enjoy management, do you really already understand how much more other people's ignorance and attitudes you will have to DEAL with (as opposed to just LIVING with it as non-management)?
2) Where are you more needed? Often times management has more underqualified individuals in it. Or just people who are otherwise qualified but just lack the management skills. Or are you that good at the techie stuff that you are the one that really makes stuff happen most of the time? How many others are there that easily could fill your spot in either position, should you not take it? I don't mean this in a "for the good of the business sense" way, but rather in the sense that making a bigger difference in either role could add additional "happiness" to the basic aspects of the jobs themselves.