Definately the Nova 5. I have a UA-5, a MTII, stereo bar, clamp, 17' XLR cables, 2 DVD batteries, IRiver, business cards, 2nd clamp, extra AA batteries, and misc. cables in my Nova. It is just easier to pack when you have the space to arrange stuff. I also find that the Nova 5 has better dividers than the Nova 4. I haven't had the luck of "testing" my Nova 5 and hope to never need to. The included cover doesn't cover as much as I would like it to, but looks to be good for repelling most things with the top closed.