Determining which Ooni is the best size for you really depends on how large of a pizza you plan on making. If you like standard sized Neapolitan pizza, you'll do well with the 12 inch series ovens like the Ooni Karu 12, Ooni Koda 12 and Ooni Fyra 12. If you prefer larger New York sized pizzas, you'll need one of the 16 inch ovens like the Ooni Koda 16, Ooni Karu 16 and Ooni Pro 16 ovens