answer is: there isn’t one perfect banana for everyone. The best choice depends on what you’re looking for.
Green Bananas: More Resistant Starch
Green bananas contain considerably more resistant starch than ripe bananas.
Resistant starch isn’t digested in the small intestine in the same way as ordinary starch. It reaches the large intestine, where it can be fermented by gut bacteria. This is one reason less-ripe bananas are sometimes considered a useful source of prebiotic carbohydrates.
Green bananas also contain less sugar and tend to be less sweet and firmer
