Pronto Pizza was my least favorite of the slices I tried during this trip. They are located near Bryant Park and may or may not be connected to a larger, nationwide chain also known as Pronto Pizza.
Sunnyside Pizza was a much better pizza experience compared to Pronto Pizza. Sunnyside Pizza is located in Queens, directly across from a stop on the 7 train.
King Umberto in Elmont has been discussed on this blog in the past, but I ended up there again twice during this particular trip to the New York area. I had a stuffed vegetable slice and a fresh mozzarella slice. I do enjoy King Umberto's stuffed slice, filled with spinach, broccoli rabe, and cheese.
A couple days later I ended up at the Hyatt House Hotel a bit upstate in Fishkill, NY. I was attending an event there, and pizza was involved. I don't think the hotel itself made these pizzas and most likely had them delivered. Regardless of where the pizza came from, these pepperoni slices were tasty. I'd rank them above Pronto Pizza.