A fixed vertical ladder is usually the best answer when footprint is limited and access is occasional. It keeps the structure compact and works well for wall-mounted or equipment-side routes.
A step ladder becomes the better option when operators use the route frequently, carry tools, or need better footing. It takes more space, but it improves movement confidence and day-to-day usability.
When reviewing a project, ask how often the route will be used, whether a person must carry items, and whether standing work is required at the top. Those answers usually point clearly toward one option or the other.
