In my opinion, 8. But everyone has their own opinion, and for good reasons. 15 for banana bread if my understanding is correct.It all depends on your intentions. If I want to make banana bread, I’d use 15 to 11. If I wanna add it to a salad or some oats, I’d use 10-9. The perfect ones to eat by themselves or cover in dark chocolate would be in my opinion 6-8. 4&5 are the ones you leave for the next day or two, they will be ready soon and 1-3 are perfect for crispy patacón de guineo with sour cream on the side.