I’ve spent time in New Haven and NYC and… not even close. Sure there’s good slices in New Haven, but there are also pizza deserts, and a lot of them. New Haven does compete with NYC on restaurant-style pizza though.
Yeah this is how this conversation typically goes "but we've got good pizza from X, Y, Z restaurant" — is not the same as just walking to the corner and paying $2 for a big cheese slice — the NY slice is essentially a street food, like street tacos are in some states along the mexican border
Also, my fave place after living in New Haven for a year was technically in West Haven (Zuppardi's) but that's splitting hairs.