Oh, this is such a great question - and so hard to answer for me! I absolutely love fruit and despite a lot of fruits being high in sugar content, I can't get enough.
I'm sorry but I can't give you just one favorite fruit, but I will give you a list of the best fruits that just rock my socks off! Can you tell I love fruit? Maybe too much... Hah, never!
So here goes: Starfruit, Strawberries, Watermelon, Honey Dew Melon, Cantaloupe, Granny Smith Apples, Red Seedless Grapes (Green seedless grapes are a close second - not a fan of seeded grapes or black grapes), Pineapples, Cherries (I just discovered I like these naturally and not maraschino cherries.), and oh-my-goodness... mango is my newest love affair in the fruit world.
The strangest thing is though, I eat banana everyday (well, technically I add it to my morning chocolate Shakeology shake) but it's not my favorite.
Really great question, you really made me realize just how hooked on fruit I am!