I’d go for the Rukus every time. And that’s not to say there’s anything inherently wrong with the Nissan Cube, but it was only sold here as a private import with all the insurance, servicing and spare-parts hassles that can bring with it.
But besides all that, the Rukus is, mechanically speaking, the previous-generation Toyota Camry, built on a Corolla platform with a super-useable boxy body. So, as well as being amazingly practical, it should also be a zero-hassle ownership experience. The Rukus might not have the pizzazz of the Nissan, but it’s the one to buy second-hand.