anywhere between 6-10 would be the perfect banana to me! i think it's a good range for me but 6-7 gets kinda close to the "does it taste too under ripe" anything past 10 is getting into "okay you're almost ready to be turned into banana bread" territory to me
I'm not sure, I guess I'd say 7-8. I'm not a huge fan when they're overripe and become mushy, but it can be a struggle to eat them when they're underripe as well.