Usable cooking area is the number that affects crisping
Usable cooking area is the flat space where food can sit with reasonable gaps between pieces. It is not the same as total basket volume. A deep basket can hold a large pile of food, but the pieces in the middle and bottom receive less direct airflow. They may cook, yet they often need repeated shaking and may not brown as evenly as food spread across a wider surface. Picture the portion you cook most often. Fries and wings need broad space because they are usually cooked in a single or nearly single layer for the best texture. A few chicken thighs may fit in a smaller basket if they can lie flat without overlapping. Vegetables can tolerate a little more crowding, but they release moisture, so a packed basket can turn roasting into steaming. Look for interior basket dimensions when available, not only the headline capacity.
