Which is more difficult to break than the linear cutting slingshot and the cold bending slingshot?

Generally speaking, as long as it is not the inferior slingshot material such as zinc alloy, it is difficult to pull the slingshot down.

Of course, if it is an extremely hard material, such as casting 440c, the internal stress of the slingshot will change due to quenching.

304, whether forging/cold bending/wire cutting, I have never heard of broken.

In short, metal slingshots are difficult to break if the materials pass the customs.