The lobster clasp is designed for single-hand use. The lever is thumb-actuated, which means you can open and release the gate without a second hand, a meaningful advantage when fastening a bracelet or necklace alone.
Made With Purpose
The tube bail developed as an alternative to the loop bail by redirecting the chain's path from vertical loop to horizontal passage through a cylinder. The weight distribution is across the full tube width rather than at a single point. The result has a different profile at the connection point and a different hang angle for the pendant than a loop bail.
Visually Speaking
Visibility is a design choice: hidden-loop bails are engineered to disappear behind the pendant, while architectural bails are meant to be seen and read as part of the front-facing composition.