If we're talking fruit pies I'd probably be very generic and say a nice apple pie would be my favorite go-to.
Of course for regional pies, the most common pie I see around the state the most is a vegetable pie known as rhubarb. A nice rhubarb and wild berry pie can be enjoyably tart and sour with that delectable hint of sweetness that rounds out the sharpness of the ingredients.
My dad's favorite pie was always Strawberry Rhubarb and I've always hated it because he bakes them for himself and they are so fucking sour when he bakes them it peels the paint off the back of your throat.