As mentioned above both Spacca and Nella's practice the art of traditional Neapolitan pizza and are very much alike (no surprise there, since Nella used to be Spacca's pizzaiola). I like them both but, unlike the above two comments, I prefer Spacca since I don't mind a bit of a soggy center and I think the higher quality ingredients (the bufala, in particular) at SN are applied with a more liberal hand. But both are excellent examples of the breed, if that's what you are looking for. (I prefer the ambience of Spacca, too, which is light, airy, hospitable, and somewhat unique, as opposed to the interior of Nella's which is a little bit more functional bar-restaurant with an oven attached.)
"The fork with two prongs is in use in northern Europe. In England, they’re armed with a steel trident, a fork with three prongs. In France we have a fork with four prongs; it’s the height of civilization." Eugene Briffault (1846)