Opting for one type of handling equipment over another will depend on the required number of entry and exit movements. In the configuration with stacker cranes — which is more cost-effective — a single shuttle car serves the various storage levels located on both sides of the working aisle. This limits the system’s operational capacity, so the stacker crane option is recommended when the number of storage/retrieval cycles per hour is not a priority. The setup with transfer cars allows for one shuttle to operate on each storage level, multiplying the number of cycles per hour by the number of storage levels.