Do you "choose/decide/determine/opine" with your heart or your head? Because?

In my social life I usually choose with my heart but in practical life I try to choose with my head

I tend to follow my gut instincts.. I can be very indecisive if I try to weigh up all the pros and cons and worry that if I spend too long in a dilemma worrying about what if's I wont do anything.. so i prefer to just jump in.. 

I am not sure I have fully answered your question ... but that's because I am not sure whether heart is the same as instinct? It's probably closer to that than head.

Too much of the time with my heart.  I'm quite a March mellow. 

I've resorted to fliping a coin to determine how I should handle something.

i use both