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NON-DRM stuff is equally available in mobi or epub.
It's true that mainstream DRMed Kindle files are only available from Amazon, but keep in mind that the alternative, ADEPT, is an Adobe proprietary system that is used by what is in reality a small handful of other book sellers. Among them B&N had (still has?) it's own proprietary DRM as well as ADE, and Kobo had (has?) kepub which was (is?) an annoyingly proprietary variant format.
In other words, if "more than one" makes you feel better than "one" even if that "one" is the biggest and most competitive market leader, and those "more that one" are really about 5, who are each really no more open, that's up to you, but IMNSHO, it's a non issue and the choice would best be driven by the features of the reader device and the shopping experience you prefer.
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