Which sling configuration has the greatest capacity?

The basket sling configuration is known for its ability to distribute the load across both legs of the sling, effectively doubling its lifting capacity compared to a single leg. When using a basket configuration, the load is cradled in the "basket," which means that the weight is shared between the two legs of the sling. This setup not only enhances the sling's loading capacity but also stabilizes the load during hoisting, making it less likely to sway or shift.

In contrast, a single leg sling is limited to lifting a load straight up and carries only the weight of the load itself without any added support from additional legs, thus offering a lessened capacity. Choker slings adjust tightly around the load, which can create a secure hold but can also limit their capacity compared to a basket sling. Double leg slings do provide added capacity relative to single leg configurations but do not match the lifting potential of the basket configuration due to the way the load is distributed.

Overall, the basket configuration's design allows for a significant increase in lifting capacity, making it the most efficient option among those presented.