> Since AFAIK there is one genus I just buy the regular ones.
That's correct, but neither 'organic' nor 'fairtrade' means that it would be a different (better) variety. Organic = not sprayed with chemicals for pest control for example; fairtrade = farm hands not paid exploitative rates (paid more).
(Not that I'm preaching you should care about either more, I'm a fairly price-driven shopper.)
In fact ceteris paribus in general you could argue you might expect that organic variety to be worse for taste, since pest/disease resistance has played a larger role in its selection.
I'm not sure that actually works in practice though, because ceteris never is paribus, it commands a premium, it's a somehow more discerning shopper perhaps/on average, so it's more worth choosing a nice tasting/attractive variety vs. the regular one selected for yield.
2 bunches of bananas cost 3,10 EUR [1]
2 bunches of organic, fairtrade bananas cost 4,38 EUR [2]
Since AFAIK there is one genus I just buy the regular ones. Since we eat one bunch of bananas a week, it is about 6,4 weeks of bananas.
My bananas come from South-America. They have to travel further than the ones going to North-America. So they should be cheaper at your place (US?).
Then again, you pay nothing for gas, so it evens out :P
[1] https://www.ah.nl/producten/product/wi197393/ah-bananen-tros
[2] https://www.ah.nl/producten/product/wi368480/ah-biologisch-f...