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No, I'm betting that the Adobe DRM will be easier to strip than the Amazon DRM. Remember that the DRM is another layer on top of the format and that ePub is in wider use around the world than Amazon's proprietary formatting.
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Actually... they're both pretty similar - with regard to 'ease' of stripping if either company were to 'disappear.'
Both use components found in the reader application combined with tokens from the ebook itself to generate a PID. As long as you have the proper ebook backed up (and a functioning reader app), both Adobe and Amazon could fade into oblivion, and your ability to strip the drm from your previous purchases would be just as 'easy' as it always was.
Neither process requires a functioning DRM server you need to connect to in order to 'do the deed'.