My go to club is quite often the driver with a few adjustments.
Coming from a tight course with plenty of OB and bush riddled with black snakes, straight drives are very important. Up short par 4's I hit a 2 or 3 iron but sometimes when the wind is in to one's face, an iron just wont do. I go to a "gripped-down piercer" - as I call it. I grip down the grip, the stance narrows naturally and the swing is a little more three quarters. I imagine a low, piercing flight that doesn't get to high (this vision feeds one's body to make the set-up changes).
The shot comes out low, straight and running (the club-face remains nice and straight, right down the line). I love playing it.
Just a note on the path of the club... I want it coming straight down the line, not inside, not outside with not much rolling of hands; straight ball flight; 3/4 swing and rip'n it.