Pecan pie is my favorite because it's sweet and sticky and crunchy and makes picking up all the pecans from the trees in my parents' and grandparents' yards worthwhile. The things are everywhere. The trees drip sap on everything, you can't walk barefoot because stepping on the sharp end of a pecan will make you curse your own mother, and shelling the pecans is the worst chore in the history of child labor, but it's all worth it for that golden brown piece of heaven. I like that. Pecan Pie: It's heaven you put in your mouth!
Side note: The word pecan is not pronounced like a container you urinate in.
Chocolate pie is a close second, even though I used to only eat the meringue when I was little. It would be my favorite, but it's so hard to make right that I rarely get a perfect one that doesn't have a weeping meringue or runny filling or soggy crust. Of course, even the not perfect ones are delicious, but a perfect one is worth its weight in gold.