I always go for instant coffee because in the first place, it's easier to prepare compared to brewed coffee. Also, I like my coffee sweet and creamy, and brewed coffee is a little bit too plain and bitter for my taste.
I don't really have a favorite type that I buy right now but that will change one day when I finally pick the best one for me. I always go with instant coffee because you just put a spoonful in the coffee cup, add hot water and stir. My coffee has to have some sweetness to it and that is the way I've always liked it. Another thing I'll put in it is cream or milk.