There are a number of differences between bananas and plantains, even though they are from the exact same genus. When you are trying to determine which fruit is larger, you will have to consider the fact that bananas vary in size, depending on what type they are and which area they come from.

On average bananas tend to be a little bit larger than plantains, though that is not always the case. Both of these fruits originate from the same genus and therefore share many different defining characteristics, including the color and even taste; they do vary in size however, depending on the type of banana.