My top 5, from someone who has never had a good mango (or really any other tropical fruit, other than the couple I had in the just-a-little-too-early-in-the-season trip to Puerto Rico):
1. Cacao
2. Brandywine tomato (homegrown, with a bit of salt and pepper, heavenly)
3. Alpine strawberry/homegrown raspberry (I had alpine strawberries once, in Poland, and they were like the most concentrated, sweetest strawberry you dream about)
4. Heirloom apple/pear (could not live without these)
5. A ripe, juicy white peach/a Polish plum (peaches in America, plums in Poland)
Honorable mention: mango (I’ve never had a good fresh mango, living in northern Virginia, but in PR I had an incredible mango smoothie, and I can understand why people love mangos.
Honorable mention 2: grape (only tried a bad rambutan once, never had lychee, so don’t know if I’d prefer them over grapes. Good grapes, especially the darker ones, are wonderful)
As for tropical, I’ve tasted quite a few of the “favorites,” but only from supermarkets where the tropical fruit section consists of three rock-hard fruits. I had a fermented cherimoya, a rotten soursop, unrepentant rambutans, unripe mangos, an unripe Mamey sapote, a bad jackfruit, a good but not amazing yellow dragonfruit, among others. In PR, I had a rose apple, that was really good but not as good as apples can get, a Spanish tamarind, also really good but just not a top 5 fruit, a jaboticaba, which for some reason I didn’t find all that good, and a Spanish lime, which was good but the seed was too big, all (except the Spanish lime) thanks to Monstoso Gardens (wish I came a month or two later, then it would be really nice). I also recently had the opportunity to eat a slightly-unripe star fruit from a guy’s “inferior” tree, and it was so incredibly juicy and flavorful, I was blown away. Not top 5 because I only had one and because the shape doesn’t really help in eating, but still, I’m sure that there are a number of fruit that if I have fresh straight off the tree which could break my top 5.