From an imagination perspective I'd guess a benefit to the 'coil' design comes down to a flex perspective.The factory one, of course, has a spiral shape which I may elect to ignore. Think that design is all about vibration damping or something equally techno-nerdy so not really up to imitate it. Just getting the diameter of the spiral to turn consistently and stay decent is a monumental PITA. Did that for my S/S lines in the Monte, Quoth the Raven, "Nevermore"!
Coils stretch and compress by nature. A body on frame construction has a body that shifts slightly under driving conditions. Now, engine if bolted to the frame on its mounts, so, fuel line doesn't need to stretch the way a fixed brake line that attaches to the master cylinder on the firewall, yet, also to the frame does. Stretch a steel line in those conditions and it'll crack. True Unibody doesn't have that sort of movement, which is why I can't recall seeing it similarly replicated. On vehicles without that flex