Re: Not having good luck with nanners inside fir the winter..
Raja puri seems to be especially forgiving about not getting enough light, though. We've got one that's probably 7 feet tall, next to a window but it doesn't get much light. It has really slowed down in its growth... not sure it's growing anymore, actually. But it still looks great - nice and stocky. When most plants don't get enough light, they put all their effort into growing tall, even if that makes them weak. The idea is, in nature if they aren't getting enough light, it is probably because another plant is shading them out. So if they can outgrow that bigger plant, then they'll be okay. But that is not the situation inside a dark house, so the way they grow is not helpful, and just makes them unnecessarily weak.
Anyway... not sure how the different cultivars compare to each other, since we only have the Raja puri at home. But I am really impressed with our Raja puri for staying kindof short and stocky despite the low lighting. Most plants would not be so well-behaved, so it wouldn't surprise me in the slightest if some other banana cultivars don't react as well to low lighting.