The Tubular Pasta Family
Rigatoni, penne, and ziti are all large tubular dried pasta shapes — but they are meaningfully different, and the difference matters for which sauces they work with.
Rigatoni
Rigatoni (from “rigato” = ridged) has ridges running along its length and a slightly wider diameter than penne. The ridges catch thick meat sauces and the wide tube holds chunks of vegetables, guanciale, or sausage. Classic with rigatoni: amatriciana, ragù, pasta al forno. The ridges are the key — they hold sauce better than smooth tubes.
Penne
Penne is cut at an angle (like a quill pen — “penna” = pen in Italian) and comes in two versions: penne lisce (smooth) and penne rigate (ridged). Penne rigate is more common and more useful. The angled cut allows sauce to enter the tube end. Classic with penne: arrabbiata, pesto, vodka sauce.
Ziti
Ziti is a smooth, straight tube — no ridges, no angled cuts. It’s less common in everyday Italian cooking but appears in baked pasta dishes (pasta al forno, pasta ‘ncasciata in Sicily). The smooth surface holds baked cheese better than ridged shapes. Classic: ziti al forno, Sicilian baked pasta.
The Rule
Thick, chunky sauces → rigatoni. Smooth, oily sauces → penne. Baked dishes → ziti.