DC adds an extra layer of isolation if something goes wrong, and an extra place for it to fail safely in a nicely enclosed metal box. It takes a really catastrophic failure for a 28A DC power supply to go much beyond 28A for very long. A mains supply can do it all day long unless there’s some other form of protection like a fuse or isolation transformer.
On the first offense, depending on circumstances. On the second offense, without exception.