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I don't think Adobe are saying that their DRM is specifically better than Apple's; that's not how I read that blog at all.
But it's certainly a concern that a proliferation of different DRMs could harm consumer acceptance of the ePub format. I see Harry's point regarding not mandating a specific DRM - but perhaps the reason for going down that route could be seen as a reaction to other schemes were a single DRM has been specified, and then broken, such as CSS in the DVD world.
No DRM at all would be lovely; but that will be a long time coming and we can't just wish it away in the meantime.
I wonder what the licensing rules for ePub are, and if they'd be able to enforce something or create some sort of label like 'secure ePub' which could mandate multiple DRM schemes, or insist on at least one common one (which would, given its deployment, likely be Adobe's) in addition to whatever else may be on offer.
In the world of digital video, certainly as deployed in Europe, there's the Common Scrambling Algorithm (CSA), which allows multiple encryption systems on a single broadcast. Something like that would be an interesting approach in an eBook standard - it would effectively allow you to download an identical file from different places, and unlock it with different keys, from Apple, B&N, Sony and other stores.
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