I would use them the same way as a banana. I am actually a big fan of plantains but never buy them. I'm not sure why. I like the difference in flavour.
I ate plantain instead of potato when I did a language immersion. I am not sure if it is better than potatoes for ecological footprint. Canada is not the right place for that. Majority of my fruits come from California and this is a big issue for ecological footprint but I don’t deal with that.