I actually love both of them, so I can see why you're having a hard time choosing! Do you already have black bags in a similar size? If so, go with the 1st one! If you don't have a black bag then go with the 2nd one.
Is the choice between navy with red cube and black with white cube? I'm not sure about other countries, but US did not have black at the boutiques or department stores, only navy, red, white, gold and pewter. With that said I'm more comfortable saying navy cube. If you're getting these from the boutique, you can't go wrong with either color, but is it's from a reseller, don't forget to have it authenticated first.