Pizza is the first food of independence. A few bucks enable a kid to enter the free market economy, and the words, “I left money for pizza,” kick start life unsupervised. It’s a hunger equalizer, powering campaigns, construction sites, term papers, mega-mergers, and eight-hour shifts. But given New York’s pizza heritage (the birthplace of American pizza) and proficiency at styles (Sicilian, grandma, neo-Neapolitan), comparing pizzas fairly can be challenging. How do you rate a classic slice against a Neapolitan pie?