Unless I know the player I just go for the first thing I see. Although I should note that in the given diagram I always prefer the "in your face move," in this case Qg5#
If it's a friend of mine, I have been known to delay mate for several moves just to make it look better. They should know better than to not resign against me :)
Qh2, because the Queen moves the least distance and I can be a bit lazy at times.