I have not had the opportunity to eat the wide variety of (to me) exotic fruits listed by other people. But, my top five, combining tropical and temperate fruits, in reverse order.
5. Too difficult to narrow down. Moro blood oranges, but it is sometimes hard to get them perfectly ripened. Cotton Candy grapes, sweet and flavorful. Hachiya persimmon. I could probably add a few more.
4. Nagami kumquat: I ate so many of these once that I burned my tongue. The sweet peel and sour pulp are almost unbeatable, in my opinion.
3. Lychee: I have yet to get tired of eating lychees.
2. Sumo (Dekopon) mandarin: Moro blood oranges were my favorite orange until I tried these at one of my local grocery stores. These are sweet without being cloying, and I have yet to have a bad one.
1. (Wild) Muscadine: I like muscadines, but my favorite fruit is from a wild (or at least feral) muscadine vine climbing up an oak tree on the shores of Wheeler Lake in rural Lawrence County, Alabama. I stayed at a lake house for a couple of summers, and in late summer, I would walk over to this vine twice a day to make sure I did not miss any fruit. Smaller than the muscadines I see in stores, those fruits were a nice shade of purple with uncommonly thin skin of a nice sour flavor and a pulp with the consistency of a soft, juicy gummy bear and a sweet, strong muscadine flavor. I wish I was into growing fruits back then; I would have taken some cuttings, but I have not been back there in six years and probably could not get permission to go onto that parcel of property today.