Both are good choices.
Only complaints you'll hear about Tattoos are the synthetics. The composites hang with anything on the market.
I have never hit a bad ZN. I've always felt they were the best for the money but the Tattoos aren't much more.
My first choice as a game ball would be the Tattoo and not just over the ZN. It would be my choice for a game ball out of everything. I would not cry if I had to hit the ZN, though. In my opinion they're the most consistent ball in terms of lack of defects and overall performance across all specs in recent years.