Best fruits
1) Blackberries 
1) Mandarins
3) Green Apples
4) Mango
5) Oranges

(Tie for first, assume all are home-grown, wild, etc)

Mandarins are the best designed fruit. 

Outer shell for protection. Fun to open. Not easy to squish. 
Can split without a knife.
Goes well with kotatsu.
Delicious citrus.

Wanna be the very best. Creator of @moxiescout /miw. ゼニゼニ

That's true if we're talking about citrus fruit. 
I wouldn't agree about being easy and fun to open - usually you have sticky hands afterwards. I would vote for the good old apple as the best designed - no need for peeling, just wash and eat.

On-chain creative + graphic designer with extensive experience in advertising.

Vilnius, Vilnius City Municipality, Lithuania

Yeah, i never tried Japanese mandarins when i think of it. We usually get ones from Spain or Turkey. Huge fan of mandarins though. The season is few months away! Bring it on.

If an apple didn't have seeds, I might be inclined to agree . Maybe your variety of mandarins are stickier than ours 😉

As for bananas, I think I personally value  the easy shareability of mandarins, though the fast peeling of bananas is a huge benefit.