I have been on both those ships and prefer the Zaandam. I thought the NA was not laid out well at all, with the Exploration Cafe way up in the Crow’s Nest. Zaandam has the cafe/lounge in the promenade deck area, where all the other venues are. It has a great library in it, with those great views and puzzles. The Explorer’s Lounge across the passageway is where there was a classical duo most nights (Jan. last year), and the Ocean Bar had a great band that played in the evenings.
I can’t speak to the Neptune suite, but the Zaandam did get the new interactive TVs when I was last on her, so it’s probably nicer than what the video shows, unless it was taken very recently.
I don’t recall how good the pizza was on Zaandam, but it did have a taco bar in the Lido pool area (across from Dive In) that was quite good. HAL is experimenting with “pop-up” restaurants for the ships that don’t have them, so there’s a good chance that there might be a Tamarind pop-up.
if I had my druthers, I’d sail on the Zaandam over the Nieuw Amsterdam any day.