That's the difference--whether or not they are legal where you are backpacking. For example, in Grand Teton NP, where they mandate containers approved by the IGBC, the Bearikade is illegal. Interestingly, in the Wind Rivers, they allow either hanging (with a method that those who know Yosemite bears would find laughable) or IGBC-approved canisters. In Yellowstone, they allow only hanging, not canisters. These three areas, of course are contiguous, or practically so. Weird!
And, of course, the Bear Vault is illegal in parts of the Adirondacks where the late Yellow-Yellow's progeny abound.
As bears wise up, of course (Yellow-Yellow being a case in point), these requirements are bound to change. Sometimes I think bears are a lot smarter than we humans!