1. If you are describing a range of sizes:
* Small to medium-sized: This is the most common and natural way to express a range.
2. If you are describing a single item that is in between small and medium:
* Small- to medium-sized: This is correct but less common.
* Medium-sized: This is a simpler and more concise option.
Examples:
* "We offer services for small to medium-sized businesses." (range of sizes)
* "The room was small- to medium-sized." (single item)
* "The room was medium-sized." (single item, simpler and concise)
In general, it's best to use "small to medium-sized" when referring to a range, and "medium-sized" when referring to a single item.