Passion fruit because the taste is both sour, floral and fruity. There's nothing quite like it. Lime because they're incredibly versatile and go great with lots of food. Mango because it's pretty much the pinnacle of sweet fruits to me.
Can also combine all three for an awesome cocktail.
Each fruit is unique and good in its own way, however here is my ranking in no particular order:
Apples
Not my overall favorite when it comes to flavor and texture, however the portability and cleanliness makes it a top contender. A sweet, crunchy apple is a delicious snack that is a staple in my life and makes me happy. I will not eat a shitty apple.
Blueberries
Blueberries are delicious and fun to eat. They're very good for you, which is a plus. Eating gallons of them right off the bush in the late summer is quite the experience. However the ones from the store always have a couple of foul tasting ones which subtracts some points.
Honeydew
A good honeydew melon is mouth-watering. The vibrant green color and refreshing flavor makes it one of my top fruits. Unfortunately it is very sticky, messy, and annoying to prepare. I'll eat a shitty honeydew melon.
Watermelon
Nothing beats a cold watermelon on a hot summer's day. It also has the added benefit of providing some much needed hydration because I am chronically dehydrated and forget to drink water. The flavor is sweet and delicious. Minus some points for it getting everywhere and being annoying to prepare.