The best is a very tart lemon cake. 99% of lemon cakes you find try to cut the sour flavor of the lemons too much. I always want to explain to the chef that people who are ordering a lemon cake probably like sour foods.
Cook’s country has a recipe for NC lemon pie made with saltine cracker crust. Easy to make and really delicious.
Homemade cobbler with real vanilla ice cream.
Serious Eats is my go to for ice cream recipes. Prob gonna try this soon since I have a big bag of Reese’s eggs in my freezer
https://www.seriouseats.com/recipes/2012/10/reeses-chocolate-peanut-butter-cup-ice-cream-recipe.html
So everyone has said pecan pie, right?
Chocolate eclair cake is crazy good too.
Publix key lime pie is some of the best there is
I'm a little surprised you've made the only mention of the bolded. Though remarkably simple to make, it still has a high ceiling especially with freshly shelled pecans picked from the orchard within the last few days before baking.
I personally don't have a "best" dessert. It all depends on factors such as mood, accompanying food/drink or season. The first thing that came to mind though, for best dessert experience was an apple pie in Amsterdam, and I'm not even a lover of apple pie generally.
I can tell you the worst - Indian sweets. I'm saying this as someone that LOVES all manner of Indian food, just not the sweets which are disgusting.