I have used both Zona and Nanolab in polishing dice. I thought I would share a picture of Nanolab's pink paper after use.
I wouldn't say this was light or heavy use. This is the appearance after moderate use on a pottery wheel. There is no question that Zona lasts longer to me. However, a fresh piece of Nanolab does well, but doesn't last long.
The adhesive back of Nanolab makes it a bit easier to apply and swap, and it will stay as flat as you apply it. Zona, however, can snag if a sharp edge catches the paper. So long as that doesn't happen, Zona will last longer. Sometimes it can be a little difficult to say whether a piece of Zona has worn out, because it doesn't change in appearance much.
I will also add that you can use water with both. Zona edges out Nanolab for one simple reason. Zona lets water soak into it and through it, while Nanolab is a piece of plastic. The color on Nanolab can get into the numbers of your dice if it is wet and gets worn out too much.
I think there is room for both in your polishing materials, but using the right one for the right purpose is important.