How much capacity do I actually need?

For 1–2 people, 4–5 quarts is generally cited as sufficient. For families of 4+ or anyone batch-cooking wings and fries, reviewers consistently point to 6.5 quarts and up, or a 10-qt dual-zone. If you want to roast a whole chicken or use sheet pans, a convection oven–style unit like the Breville is the form factor most reviewers recommend.