What is the best option for capturing data in a grid layout on a catalog item?

The best option for capturing data in a grid layout on a catalog item is the multi-row variable set. This variable type is specifically designed to allow users to enter multiple rows of data structured in a tabular format. It is particularly useful when there is a need to collect a series of related variables, allowing users to provide the necessary information in an organized manner.

The multi-row variable set enhances user experience by presenting data in a clear, grid-like format, making it easier for users to fill out multiple entries under the same category. This is particularly important in scenarios where items require additional information that cannot be efficiently captured in single-line variables.

Other options, such as a standard variable set, might capture variables, but they do not provide the structural organization required for grid layouts. A cascade variable is designed for dependent variable relationships and does not support multiple entries in a grid format. The grid variable, while it might sound fitting, is not the standard terminology used in ServiceNow for this specific capability. Thus, the multi-row variable set stands out as the most effective solution for this requirement.